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[Commit-gnuradio] [gnuradio] 27/37: examples: Ported examples in GNU Rad


From: git
Subject: [Commit-gnuradio] [gnuradio] 27/37: examples: Ported examples in GNU Radio tree to QT.
Date: Thu, 17 Jul 2014 20:23:42 +0000 (UTC)

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trondeau pushed a commit to branch master
in repository gnuradio.

commit 58cb65c12c409245e4e22f84d9795021a6153178
Author: Martin Braun <address@hidden>
Date:   Wed Jul 9 16:02:36 2014 +0200

    examples: Ported examples in GNU Radio tree to QT.
---
 gr-audio/examples/grc/cvsd_sweep.grc               | 2322 ++++++++++++++----
 gr-audio/examples/grc/dial_tone.grc                |  332 ++-
 gr-blocks/examples/ctrlport/pfb_sync_test-qt.grc   |  854 -------
 gr-blocks/examples/ctrlport/pfb_sync_test.grc      |  514 ++--
 gr-channels/examples/demo_spec_an.grc              | 1542 ++++++++----
 gr-digital/examples/demod/ber_simulation.grc       |  992 ++++++--
 gr-digital/examples/demod/digital_freq_lock.grc    | 1578 +++++++++---
 gr-digital/examples/demod/dpsk_loopback.grc        |  690 ++++--
 gr-digital/examples/demod/pam_sync.grc             | 2108 ++++++++++++----
 gr-digital/examples/demod/pam_timing.grc           | 2428 ++++++++++++++----
 gr-digital/examples/ofdm/ofdm_loopback.grc         | 1120 ++++++---
 gr-digital/examples/ofdm/rx_ofdm.grc               |  358 ++-
 gr-digital/examples/ofdm/tx_ofdm.grc               | 1134 +++++++--
 gr-filter/examples/resampler_demo.grc              |  571 +++--
 .../examples/grc/interference_cancellation.grc     | 2588 ++++++++++++++------
 gr-trellis/examples/grc/pccc.grc                   |  576 +++--
 gr-trellis/examples/grc/sccc.grc                   |  516 ++--
 gr-uhd/examples/grc/uhd_const_wave.grc             |  468 ++--
 gr-uhd/examples/grc/uhd_dpsk_mod.grc               | 2295 ++++++++++++++---
 gr-uhd/examples/grc/uhd_fft.grc                    | 1749 ++++++++-----
 gr-uhd/examples/grc/uhd_rx_dpsk.grc                | 1073 ++++----
 gr-uhd/examples/grc/uhd_two_tone_loopback.grc      |  944 ++++---
 gr-uhd/examples/grc/uhd_tx_dpsk.grc                |  562 +++--
 gr-uhd/examples/grc/uhd_wbfm_receive.grc           |  784 ++++--
 grc/examples/simple/variable_config.grc            |  398 ++-
 grc/examples/xmlrpc/xmlrpc_client.grc              |  262 +-
 grc/examples/xmlrpc/xmlrpc_server.grc              |  750 ++++--
 27 files changed, 21019 insertions(+), 8489 deletions(-)

diff --git a/gr-audio/examples/grc/cvsd_sweep.grc 
b/gr-audio/examples/grc/cvsd_sweep.grc
index 00da399..a4eddfb 100644
--- a/gr-audio/examples/grc/cvsd_sweep.grc
+++ b/gr-audio/examples/grc/cvsd_sweep.grc
@@ -1,59 +1,81 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:10:11 2012</timestamp>
+  <timestamp>Sat Jul 12 14:30:30 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>cvsd_sweep</value>
+      <value>resample</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>CVSD Vocoder Test</value>
+      <key>value</key>
+      <value>8</value>
     </param>
     <param>
-      <key>author</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>description</key>
-      <value></value>
+      <key>_coordinate</key>
+      <value>(356, 0)</value>
     </param>
     <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
+      <key>id</key>
+      <value>audio_rate</value>
     </param>
     <param>
-      <key>category</key>
-      <value>Custom</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>run_options</key>
-      <value>prompt</value>
+      <key>value</key>
+      <value>8000</value>
     </param>
     <param>
-      <key>run</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>max_nouts</key>
+      <key>_coordinate</key>
+      <value>(260, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>bw</value>
+    </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(449, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,8 +97,12 @@
       <value>import math</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(157, 11)</value>
+      <value>(157, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,26 +110,50 @@
     </param>
   </block>
   <block>
-    <key>vocoder_cvsd_decode_bf</key>
+    <key>qtgui_tab_widget</key>
     <param>
       <key>id</key>
-      <value>vocoder_cvsd_decode_bf_0</value>
+      <value>displays</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>resample</key>
-      <value>resample</value>
+      <key>num_tabs</key>
+      <value>3</value>
     </param>
     <param>
-      <key>bw</key>
-      <value>bw</value>
+      <key>label0</key>
+      <value>Original</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Encoded</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Decoded</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>Tab 3</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value>Tab 4</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(887, 340)</value>
+      <value>(0, 89)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -111,57 +161,62 @@
     </param>
   </block>
   <block>
-    <key>blocks_vco_f</key>
+    <key>options</key>
     <param>
       <key>id</key>
-      <value>vco</value>
+      <value>cvsd_sweep</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>title</key>
+      <value>CVSD Vocoder Test</value>
     </param>
     <param>
-      <key>sensitivity</key>
-      <value>audio_rate*2*math.pi</value>
+      <key>author</key>
+      <value></value>
     </param>
     <param>
-      <key>amplitude</key>
-      <value>0.9</value>
+      <key>description</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(427, 332)</value>
+      <key>window_size</key>
+      <value>1280, 1024</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>generate_options</key>
+      <value>qt_gui</value>
     </param>
-  </block>
-  <block>
-    <key>vocoder_cvsd_encode_fb</key>
     <param>
-      <key>id</key>
-      <value>enc</value>
+      <key>category</key>
+      <value>Custom</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
       <value>True</value>
     </param>
     <param>
-      <key>resample</key>
-      <value>resample</value>
+      <key>max_nouts</key>
+      <value>0</value>
     </param>
     <param>
-      <key>bw</key>
-      <value>bw</value>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(655, 340)</value>
+      <value>(-1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -169,10 +224,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_packed_to_unpacked_xx</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>p2u</value>
+      <value>qtgui_time_sink_x_0_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -180,430 +235,1808 @@
     </param>
     <param>
       <key>type</key>
-      <value>byte</value>
+      <value>float</value>
     </param>
     <param>
-      <key>bits_per_chunk</key>
-      <value>1</value>
+      <key>name</key>
+      <value>Decoded Waveform</value>
     </param>
     <param>
-      <key>endianness</key>
-      <value>gr.GR_MSB_FIRST</value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>srate</key>
+      <value>audio_rate</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(648, 415)</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_char_to_float</key>
     <param>
-      <key>id</key>
-      <value>c2f</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
       <value>True</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>gui_hint</key>
+      <value>address@hidden:1,0,1,1</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(676, 483)</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>audio_sink</key>
     <param>
-      <key>id</key>
-      <value>audio_sink</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>device_name</key>
-      <value>plughw:0,0</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ok_to_block</key>
-      <value>True</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style1</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1127, 340)</value>
+      <key>marker1</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>audio_rate</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>8000</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(251, 10)</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>resample</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>8</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(344, 11)</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>bw</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0.5</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(431, 11)</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
-  </block>
-  <block>
-    <key>notebook</key>
     <param>
-      <key>id</key>
-      <value>displays</value>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.NB_TOP</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>['Original','Encoded','Decoded']</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(12, 106)</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_fftsink2</key>
     <param>
-      <key>id</key>
-      <value>orig_fft</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Original Spectrum</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1114, 319)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>vocoder_cvsd_decode_bf</key>
+    <param>
+      <key>id</key>
+      <value>vocoder_cvsd_decode_bf_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>resample</key>
+      <value>resample</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>bw</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(868, 225)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Original Waveform</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:1,0,1,1</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(388, 315)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Decoded Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:0,0,1,1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1122, 90)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>vocoder_cvsd_encode_fb</key>
+    <param>
+      <key>id</key>
+      <value>enc</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>resample</key>
+      <value>resample</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>bw</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(636, 226)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_packed_to_unpacked_xx</key>
+    <param>
+      <key>id</key>
+      <value>p2u</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>bits_per_chunk</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_MSB_FIRST</value>
+    </param>
+    <param>
+      <key>num_ports</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(629, 301)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>id</key>
+      <value>throttle</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(219, 234)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_sig_source_x</key>
+    <param>
+      <key>id</key>
+      <value>analog_sig_source_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>waveform</key>
+      <value>analog.GR_TRI_WAVE</value>
+    </param>
+    <param>
+      <key>freq</key>
+      <value>0.05</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>0.5</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(17, 202)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vco_f</key>
+    <param>
+      <key>id</key>
+      <value>vco</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>sensitivity</key>
+      <value>audio_rate*2*math.pi</value>
+    </param>
+    <param>
+      <key>amplitude</key>
+      <value>0.9</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(398, 218)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_char_to_float</key>
+    <param>
+      <key>id</key>
+      <value>c2f</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(657, 369)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Encoded Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:0,0,1,1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(508, 444)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Encoded Waveform</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>audio_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:1,0,1,1</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 1</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>displays, 0</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(415, 97)</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>orig_scope</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Original Waveform</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>width7</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 1</value>
+      <key>style7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>displays, 0</value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(414, 425)</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>enc_scope</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Encoded Waveform</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate*resample</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0.5</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>20.0/(audio_rate*resample)</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>width10</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 1</value>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>displays, 1</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(858, 591)</value>
+      <value>(826, 444)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -611,10 +2044,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>dec_fft</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -625,325 +2058,276 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Decoded Spectrum</value>
+      <key>name</key>
+      <value>Original Spectrum</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>fftsize</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>5</value>
+      <key>fc</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>bw</key>
+      <value>audio_rate</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>autoscale</key>
+      <value>True</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>0.1</value>
+      <key>average</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>ymin</key>
+      <value>-140</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>ymax</key>
+      <value>10</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>gui_hint</key>
+      <value>address@hidden:0,0,1,1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 1</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>displays, 2</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(891, 98)</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>dec_scope</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Decoded Waveform</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>width5</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 1</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>displays, 2</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(889, 422)</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>label7</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
     <param>
-      <key>id</key>
-      <value>throttle</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>audio_rate</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>width8</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(238, 348)</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>analog_sig_source_x</key>
     <param>
-      <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>audio_rate</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_TRI_WAVE</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>freq</key>
-      <value>0.05</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>0.5</value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(29, 316)</value>
+      <value>(385, 95)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>0</value>
+      <value>180</value>
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>audio_sink</key>
     <param>
       <key>id</key>
-      <value>enc_fft</value>
+      <value>audio_sink</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>Encoded Spectrum</value>
-    </param>
-    <param>
       <key>samp_rate</key>
-      <value>audio_rate*resample</value>
-    </param>
-    <param>
-      <key>baseband_freq</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>y_per_div</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>y_divs</key>
-      <value>8</value>
-    </param>
-    <param>
-      <key>ref_level</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
-    </param>
-    <param>
-      <key>fft_size</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>fft_rate</key>
-      <value>30</value>
-    </param>
-    <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <value>audio_rate</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>device_name</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>ok_to_block</key>
+      <value>True</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>num_inputs</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 1</value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value>displays, 1</value>
-    </param>
-    <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(610, 559)</value>
+      <value>(1110, 225)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <connection>
-    <source_block_id>vco</source_block_id>
-    <sink_block_id>orig_fft</sink_block_id>
+    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_1</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -966,56 +2350,56 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>vco</source_block_id>
-    <sink_block_id>orig_scope</sink_block_id>
+    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
+    <sink_block_id>audio_sink</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
-    <sink_block_id>dec_fft</sink_block_id>
+    <source_block_id>enc</source_block_id>
+    <sink_block_id>p2u</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
-    <sink_block_id>dec_scope</sink_block_id>
+    <source_block_id>p2u</source_block_id>
+    <sink_block_id>c2f</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
-    <sink_block_id>audio_sink</sink_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>throttle</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>enc</source_block_id>
-    <sink_block_id>p2u</sink_block_id>
+    <source_block_id>vco</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>p2u</source_block_id>
-    <sink_block_id>c2f</sink_block_id>
+    <source_block_id>vco</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>c2f</source_block_id>
-    <sink_block_id>enc_fft</sink_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>c2f</source_block_id>
-    <sink_block_id>enc_scope</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>throttle</sink_block_id>
+    <source_block_id>vocoder_cvsd_decode_bf_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0_1</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-audio/examples/grc/dial_tone.grc 
b/gr-audio/examples/grc/dial_tone.grc
index 2503fed..74ee4fc 100644
--- a/gr-audio/examples/grc/dial_tone.grc
+++ b/gr-audio/examples/grc/dial_tone.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:10:08 2012</timestamp>
+  <timestamp>Sat Jul 12 14:32:31 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(0, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -61,34 +65,26 @@
     </param>
   </block>
   <block>
-    <key>audio_sink</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>audio_sink</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>value</key>
       <value>32000</value>
     </param>
     <param>
-      <key>device_name</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>ok_to_block</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>num_inputs</key>
-      <value>1</value>
-    </param>
-    <param>
       <key>_coordinate</key>
-      <value>(699, 112)</value>
+      <value>(188, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -96,54 +92,46 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>blocks_add_xx</key>
     <param>
       <key>id</key>
-      <value>ampl</value>
+      <value>blocks_add_xx</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Volume</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>.4</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>max</key>
-      <value>.5</value>
+      <key>num_inputs</key>
+      <value>3</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 2</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(634, 413)</value>
+      <value>(584, 118)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -151,54 +139,50 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>noise</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Noise</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>.005</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
     </param>
     <param>
-      <key>max</key>
-      <value>.2</value>
+      <key>amp</key>
+      <value>noise</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>seed</key>
+      <value>-42</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 2</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(443, 412)</value>
+      <value>(298, 247)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -206,53 +190,58 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>analog_sig_source_x</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>analog_sig_source_x_1</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32000</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(11, 171)</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_add_xx</key>
     <param>
-      <key>id</key>
-      <value>blocks_add_xx</value>
+      <key>freq</key>
+      <value>440</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>amp</key>
+      <value>ampl</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>offset</key>
+      <value>0</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>3</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(513, 277)</value>
+      <value>(303, 119)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -294,8 +283,24 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(251, 100)</value>
+      <value>(304, 5)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -303,42 +308,101 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>audio_sink</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_1</value>
+      <value>audio_sink</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>samp_rate</key>
+      <value>32000</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>device_name</key>
+      <value></value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>ok_to_block</key>
+      <value>True</value>
     </param>
     <param>
-      <key>freq</key>
-      <value>440</value>
+      <key>num_inputs</key>
+      <value>1</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>ampl</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>offset</key>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(783, 146)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>noise</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Noise Amplitude</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.005</value>
+    </param>
+    <param>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
+      <key>stop</key>
+      <value>.2</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1, 0, 1, 2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(250, 214)</value>
+      <value>(661, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -346,34 +410,58 @@
     </param>
   </block>
   <block>
-    <key>analog_noise_source_x</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <value>ampl</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label</key>
+      <value>Volume</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
+      <key>value</key>
+      <value>.4</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>noise</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>-42</value>
+      <key>stop</key>
+      <value>.5</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0, 0, 1, 2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(245, 342)</value>
+      <value>(803, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -381,16 +469,10 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blocks_add_xx</source_block_id>
-    <sink_block_id>audio_sink</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <source_block_id>analog_noise_source_x_0</source_block_id>
     <sink_block_id>blocks_add_xx</sink_block_id>
     <source_key>0</source_key>
-    <sink_key>0</sink_key>
+    <sink_key>2</sink_key>
   </connection>
   <connection>
     <source_block_id>analog_sig_source_x_1</source_block_id>
@@ -399,9 +481,15 @@
     <sink_key>1</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_noise_source_x_0</source_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
     <sink_block_id>blocks_add_xx</sink_block_id>
     <source_key>0</source_key>
-    <sink_key>2</sink_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_add_xx</source_block_id>
+    <sink_block_id>audio_sink</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
   </connection>
 </flow_graph>
diff --git a/gr-blocks/examples/ctrlport/pfb_sync_test-qt.grc 
b/gr-blocks/examples/ctrlport/pfb_sync_test-qt.grc
deleted file mode 100644
index 0c39735..0000000
--- a/gr-blocks/examples/ctrlport/pfb_sync_test-qt.grc
+++ /dev/null
@@ -1,854 +0,0 @@
-<?xml version='1.0' encoding='ASCII'?>
-<flow_graph>
-  <timestamp>Sun Mar 17 21:00:28 2013</timestamp>
-  <block>
-    <key>options</key>
-    <param>
-      <key>id</key>
-      <value>pfb_sync_test_qt</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value></value>
-    </param>
-    <param>
-      <key>author</key>
-      <value></value>
-    </param>
-    <param>
-      <key>description</key>
-      <value></value>
-    </param>
-    <param>
-      <key>window_size</key>
-      <value>1280,1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>qt_gui</value>
-    </param>
-    <param>
-      <key>category</key>
-      <value>Custom</value>
-    </param>
-    <param>
-      <key>run_options</key>
-      <value>prompt</value>
-    </param>
-    <param>
-      <key>run</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>max_nouts</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>realtime_scheduling</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(10, 10)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>sps</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(105, 126)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>300000</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(14, 124)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>import</key>
-    <param>
-      <key>id</key>
-      <value>import_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>import</key>
-      <value>import random, math, cmath</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(14, 77)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_packed_to_unpacked_xx</key>
-    <param>
-      <key>id</key>
-      <value>blocks_packed_to_unpacked_xx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>bits_per_chunk</key>
-      <value>8</value>
-    </param>
-    <param>
-      <key>endianness</key>
-      <value>gr.GR_MSB_FIRST</value>
-    </param>
-    <param>
-      <key>num_ports</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(419, 10)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
-    <param>
-      <key>id</key>
-      <value>blocks_throttle_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>vlen</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(436, 97)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>digital_psk_mod</key>
-    <param>
-      <key>id</key>
-      <value>digital_psk_mod_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>constellation_points</key>
-      <value>4</value>
-    </param>
-    <param>
-      <key>mod_code</key>
-      <value>"gray"</value>
-    </param>
-    <param>
-      <key>differential</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>samples_per_symbol</key>
-      <value>sps</value>
-    </param>
-    <param>
-      <key>excess_bw</key>
-      <value>0.35</value>
-    </param>
-    <param>
-      <key>verbose</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>log</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(627, 65)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>digital_pfb_clock_sync_xxx</key>
-    <param>
-      <key>id</key>
-      <value>digital_pfb_clock_sync_xxx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>ccf</value>
-    </param>
-    <param>
-      <key>sps</key>
-      <value>sps</value>
-    </param>
-    <param>
-      <key>loop_bw</key>
-      <value>2*3.14/100.0</value>
-    </param>
-    <param>
-      <key>taps</key>
-      <value>firdes.root_raised_cosine(nfilts, nfilts,1.0/sps, 0.35, 
int(22*sps*nfilts))</value>
-    </param>
-    <param>
-      <key>filter_size</key>
-      <value>nfilts</value>
-    </param>
-    <param>
-      <key>init_phase</key>
-      <value>nfilts/2</value>
-    </param>
-    <param>
-      <key>max_dev</key>
-      <value>1.5</value>
-    </param>
-    <param>
-      <key>osps</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(339, 195)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>nfilts</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>32</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(74, 390)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>amps</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>[1]</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(7, 390)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>graymap</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>[[3,1,0,2]]</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(7, 326)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>qtgui_const_sink_x</key>
-    <param>
-      <key>id</key>
-      <value>qtgui_const_sink_x_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>name</key>
-      <value></value>
-    </param>
-    <param>
-      <key>size</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>ymin</key>
-      <value>-2</value>
-    </param>
-    <param>
-      <key>ymax</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>xmin</key>
-      <value>-2</value>
-    </param>
-    <param>
-      <key>xmax</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>nconnections</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>update_time</key>
-      <value>0.10</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(752, 196)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>channels_channel_model</key>
-    <param>
-      <key>id</key>
-      <value>channels_channel_model_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>noise_voltage</key>
-      <value>noise</value>
-    </param>
-    <param>
-      <key>freq_offset</key>
-      <value>0.0</value>
-    </param>
-    <param>
-      <key>epsilon</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>taps</key>
-      <value>cmath.exp(1j*phase)</value>
-    </param>
-    <param>
-      <key>seed</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(68, 211)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_ctrlport_probe2_c</key>
-    <param>
-      <key>id</key>
-      <value>received_probe2</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>name</key>
-      <value>received</value>
-    </param>
-    <param>
-      <key>desc</key>
-      <value>Constellation Points</value>
-    </param>
-    <param>
-      <key>len</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(195, 519)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_qtgui_range</key>
-    <param>
-      <key>id</key>
-      <value>phase</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Phase</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0.5</value>
-    </param>
-    <param>
-      <key>start</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>stop</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>step</key>
-      <value>0.01</value>
-    </param>
-    <param>
-      <key>widget</key>
-      <value>counter_slider</value>
-    </param>
-    <param>
-      <key>orient</key>
-      <value>Qt.Horizontal</value>
-    </param>
-    <param>
-      <key>min_len</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(266, 344)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_ctrlport_probe2_c</key>
-    <param>
-      <key>id</key>
-      <value>time_probe2</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>name</key>
-      <value>time locked</value>
-    </param>
-    <param>
-      <key>desc</key>
-      <value>Constellation Points</value>
-    </param>
-    <param>
-      <key>len</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(447, 440)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_qtgui_range</key>
-    <param>
-      <key>id</key>
-      <value>noise</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Noise</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0.050</value>
-    </param>
-    <param>
-      <key>start</key>
-      <value>0.0001</value>
-    </param>
-    <param>
-      <key>stop</key>
-      <value>2</value>
-    </param>
-    <param>
-      <key>step</key>
-      <value>0.01</value>
-    </param>
-    <param>
-      <key>widget</key>
-      <value>counter_slider</value>
-    </param>
-    <param>
-      <key>orient</key>
-      <value>Qt.Horizontal</value>
-    </param>
-    <param>
-      <key>min_len</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>gui_hint</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(7, 455)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>digital_costas_loop_cc</key>
-    <param>
-      <key>id</key>
-      <value>digital_costas_loop_cc_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>w</key>
-      <value>6.28/100.0</value>
-    </param>
-    <param>
-      <key>order</key>
-      <value>4</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(610, 279)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_null_sink</key>
-    <param>
-      <key>id</key>
-      <value>blocks_null_sink_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>vlen</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(859, 279)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_ctrlport_probe2_c</key>
-    <param>
-      <key>id</key>
-      <value>phase_probe2</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>name</key>
-      <value>phase locked</value>
-    </param>
-    <param>
-      <key>desc</key>
-      <value>Constellation Points</value>
-    </param>
-    <param>
-      <key>len</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(681, 379)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_vector_source_x</key>
-    <param>
-      <key>id</key>
-      <value>blocks_vector_source_x_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>vector</key>
-      
<value>(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50)</value>
-    </param>
-    <param>
-      <key>tags</key>
-      <value>[]</value>
-    </param>
-    <param>
-      <key>repeat</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>vlen</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(190, 71)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_ctrlport_monitor</key>
-    <param>
-      <key>id</key>
-      <value>blocks_ctrlport_monitor_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>en</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(193, 7)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>digital_psk_mod_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_costas_loop_cc_0</source_block_id>
-    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>1</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_costas_loop_cc_0</source_block_id>
-    <sink_block_id>blocks_null_sink_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>digital_pfb_clock_sync_xxx_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_psk_mod_0</source_block_id>
-    <sink_block_id>channels_channel_model_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_costas_loop_cc_0</source_block_id>
-    <sink_block_id>phase_probe2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_packed_to_unpacked_xx_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_vector_source_x_0</source_block_id>
-    <sink_block_id>blocks_packed_to_unpacked_xx_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>received_probe2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>time_probe2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>digital_costas_loop_cc_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-</flow_graph>
diff --git a/gr-blocks/examples/ctrlport/pfb_sync_test.grc 
b/gr-blocks/examples/ctrlport/pfb_sync_test.grc
index 06692aa..0c39735 100644
--- a/gr-blocks/examples/ctrlport/pfb_sync_test.grc
+++ b/gr-blocks/examples/ctrlport/pfb_sync_test.grc
@@ -1,11 +1,11 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Mar 17 21:01:36 2013</timestamp>
+  <timestamp>Sun Mar 17 21:00:28 2013</timestamp>
   <block>
     <key>options</key>
     <param>
       <key>id</key>
-      <value>pfb_sync_test</value>
+      <value>pfb_sync_test_qt</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -25,11 +25,11 @@
     </param>
     <param>
       <key>window_size</key>
-      <value>1280, 1024</value>
+      <value>1280,1024</value>
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -61,22 +61,22 @@
     </param>
   </block>
   <block>
-    <key>import</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>import_0</value>
+      <value>sps</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>import</key>
-      <value>import random, math, cmath</value>
+      <key>value</key>
+      <value>2</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(14, 77)</value>
+      <value>(105, 126)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -107,22 +107,22 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>import</key>
     <param>
       <key>id</key>
-      <value>graymap</value>
+      <value>import_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>[[3,1,0,2]]</value>
+      <key>import</key>
+      <value>import random, math, cmath</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(32, 387)</value>
+      <value>(14, 77)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -130,22 +130,34 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blocks_packed_to_unpacked_xx</key>
     <param>
       <key>id</key>
-      <value>amps</value>
+      <value>blocks_packed_to_unpacked_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>[1]</value>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>bits_per_chunk</key>
+      <value>8</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_MSB_FIRST</value>
+    </param>
+    <param>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(32, 451)</value>
+      <value>(419, 10)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -153,22 +165,30 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>nfilts</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32</value>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(99, 451)</value>
+      <value>(436, 97)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -176,49 +196,46 @@
     </param>
   </block>
   <block>
-    <key>digital_costas_loop_cc</key>
+    <key>digital_psk_mod</key>
     <param>
       <key>id</key>
-      <value>digital_costas_loop_cc_0</value>
+      <value>digital_psk_mod_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>w</key>
-      <value>6.28/100.0</value>
-    </param>
-    <param>
-      <key>order</key>
+      <key>constellation_points</key>
       <value>4</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(626, 223)</value>
+      <key>mod_code</key>
+      <value>"gray"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>differential</key>
+      <value>True</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
+      <key>samples_per_symbol</key>
       <value>sps</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>excess_bw</key>
+      <value>0.35</value>
     </param>
     <param>
-      <key>value</key>
-      <value>2</value>
+      <key>verbose</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(105, 126)</value>
+      <value>(627, 65)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -226,10 +243,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_null_sink</key>
+    <key>digital_pfb_clock_sync_xxx</key>
     <param>
       <key>id</key>
-      <value>blocks_null_sink_0</value>
+      <value>digital_pfb_clock_sync_xxx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -237,15 +254,39 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>ccf</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>sps</key>
+      <value>sps</value>
+    </param>
+    <param>
+      <key>loop_bw</key>
+      <value>2*3.14/100.0</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>firdes.root_raised_cosine(nfilts, nfilts,1.0/sps, 0.35, 
int(22*sps*nfilts))</value>
+    </param>
+    <param>
+      <key>filter_size</key>
+      <value>nfilts</value>
+    </param>
+    <param>
+      <key>init_phase</key>
+      <value>nfilts/2</value>
+    </param>
+    <param>
+      <key>max_dev</key>
+      <value>1.5</value>
+    </param>
+    <param>
+      <key>osps</key>
       <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(964, 200)</value>
+      <value>(339, 195)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -253,54 +294,68 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>noise</value>
+      <value>nfilts</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value></value>
+      <key>value</key>
+      <value>32</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0.05</value>
+      <key>_coordinate</key>
+      <value>(74, 390)</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0.00000001</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>max</key>
-      <value>2</value>
+      <key>id</key>
+      <value>amps</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>value</key>
+      <value>[1]</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>_coordinate</key>
+      <value>(7, 390)</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>id</key>
+      <value>graymap</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>[[3,1,0,2]]</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(281, 406)</value>
+      <value>(7, 326)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -308,54 +363,58 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>qtgui_const_sink_x</key>
     <param>
       <key>id</key>
-      <value>phase</value>
+      <value>qtgui_const_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
       <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>ymin</key>
+      <value>-2</value>
     </param>
     <param>
-      <key>max</key>
+      <key>ymax</key>
       <value>2</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>xmin</key>
+      <value>-2</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>xmax</key>
+      <value>2</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>nconnections</key>
+      <value>2</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(167, 405)</value>
+      <value>(752, 196)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -363,50 +422,69 @@
     </param>
   </block>
   <block>
-    <key>digital_pfb_clock_sync_xxx</key>
+    <key>channels_channel_model</key>
     <param>
       <key>id</key>
-      <value>digital_pfb_clock_sync_xxx_0</value>
+      <value>channels_channel_model_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ccf</value>
+      <key>noise_voltage</key>
+      <value>noise</value>
     </param>
     <param>
-      <key>sps</key>
-      <value>sps</value>
+      <key>freq_offset</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>loop_bw</key>
-      <value>2*3.14/100.0</value>
+      <key>epsilon</key>
+      <value>1.0</value>
     </param>
     <param>
       <key>taps</key>
-      <value>firdes.root_raised_cosine(nfilts, nfilts,1.0/sps, 0.35, 
int(22*sps*nfilts))</value>
+      <value>cmath.exp(1j*phase)</value>
     </param>
     <param>
-      <key>filter_size</key>
-      <value>nfilts</value>
+      <key>seed</key>
+      <value>0</value>
     </param>
     <param>
-      <key>init_phase</key>
-      <value>nfilts/2</value>
+      <key>_coordinate</key>
+      <value>(68, 211)</value>
     </param>
     <param>
-      <key>max_dev</key>
-      <value>1.5</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_ctrlport_probe2_c</key>
     <param>
-      <key>osps</key>
-      <value>1</value>
+      <key>id</key>
+      <value>received_probe2</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>received</value>
+    </param>
+    <param>
+      <key>desc</key>
+      <value>Constellation Points</value>
+    </param>
+    <param>
+      <key>len</key>
+      <value>1024</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(322, 231)</value>
+      <value>(195, 519)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -414,46 +492,54 @@
     </param>
   </block>
   <block>
-    <key>digital_psk_mod</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>digital_psk_mod_0</value>
+      <value>phase</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>constellation_points</key>
-      <value>4</value>
+      <key>label</key>
+      <value>Phase</value>
     </param>
     <param>
-      <key>mod_code</key>
-      <value>"gray"</value>
+      <key>value</key>
+      <value>0.5</value>
     </param>
     <param>
-      <key>differential</key>
-      <value>True</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>samples_per_symbol</key>
-      <value>sps</value>
+      <key>stop</key>
+      <value>2</value>
     </param>
     <param>
-      <key>excess_bw</key>
-      <value>0.35</value>
+      <key>step</key>
+      <value>0.01</value>
     </param>
     <param>
-      <key>verbose</key>
-      <value>False</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(846, 32)</value>
+      <value>(266, 344)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -461,38 +547,85 @@
     </param>
   </block>
   <block>
-    <key>channels_channel_model</key>
+    <key>blocks_ctrlport_probe2_c</key>
     <param>
       <key>id</key>
-      <value>channels_channel_model_0</value>
+      <value>time_probe2</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>noise_voltage</key>
-      <value>noise</value>
+      <key>name</key>
+      <value>time locked</value>
     </param>
     <param>
-      <key>freq_offset</key>
-      <value>0.0</value>
+      <key>desc</key>
+      <value>Constellation Points</value>
     </param>
     <param>
-      <key>epsilon</key>
-      <value>1.0</value>
+      <key>len</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>cmath.exp(1j*phase)</value>
+      <key>_coordinate</key>
+      <value>(447, 440)</value>
     </param>
     <param>
-      <key>seed</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>noise</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Noise</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.050</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0.0001</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
     <param>
       <key>_coordinate</key>
-      <value>(73, 247)</value>
+      <value>(7, 455)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -500,34 +633,53 @@
     </param>
   </block>
   <block>
-    <key>blocks_file_source</key>
+    <key>digital_costas_loop_cc</key>
     <param>
       <key>id</key>
-      <value>blocks_file_source_0</value>
+      <value>digital_costas_loop_cc_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>file</key>
-      <value>/dev/urandom</value>
+      <key>w</key>
+      <value>6.28/100.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>order</key>
+      <value>4</value>
     </param>
     <param>
-      <key>repeat</key>
+      <key>_coordinate</key>
+      <value>(610, 279)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_null_sink</key>
+    <param>
+      <key>id</key>
+      <value>blocks_null_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(229, 56)</value>
+      <value>(859, 279)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -535,30 +687,30 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>blocks_ctrlport_probe2_c</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>phase_probe2</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>name</key>
+      <value>phase locked</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>desc</key>
+      <value>Constellation Points</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>len</key>
+      <value>1024</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(623, 64)</value>
+      <value>(681, 379)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -566,10 +718,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_packed_to_unpacked_xx</key>
+    <key>blocks_vector_source_x</key>
     <param>
       <key>id</key>
-      <value>blocks_packed_to_unpacked_xx_0</value>
+      <value>blocks_vector_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -580,20 +732,24 @@
       <value>byte</value>
     </param>
     <param>
-      <key>bits_per_chunk</key>
-      <value>8</value>
+      <key>vector</key>
+      
<value>(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50)</value>
     </param>
     <param>
-      <key>endianness</key>
-      <value>gr.GR_MSB_FIRST</value>
+      <key>tags</key>
+      <value>[]</value>
     </param>
     <param>
-      <key>num_ports</key>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>vlen</key>
       <value>1</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(415, 56)</value>
+      <value>(190, 71)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -616,7 +772,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(229, 7)</value>
+      <value>(193, 7)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -631,12 +787,18 @@
   </connection>
   <connection>
     <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>digital_costas_loop_cc_0</sink_block_id>
+    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>digital_costas_loop_cc_0</source_block_id>
+    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_costas_loop_cc_0</source_block_id>
     <sink_block_id>blocks_null_sink_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
@@ -654,8 +816,8 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_file_source_0</source_block_id>
-    <sink_block_id>blocks_packed_to_unpacked_xx_0</sink_block_id>
+    <source_block_id>digital_costas_loop_cc_0</source_block_id>
+    <sink_block_id>phase_probe2</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -665,4 +827,28 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0</source_block_id>
+    <sink_block_id>blocks_packed_to_unpacked_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>channels_channel_model_0</source_block_id>
+    <sink_block_id>received_probe2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
+    <sink_block_id>time_probe2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
+    <sink_block_id>digital_costas_loop_cc_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-channels/examples/demo_spec_an.grc 
b/gr-channels/examples/demo_spec_an.grc
index 572ded6..0a13f64 100644
--- a/gr-channels/examples/demo_spec_an.grc
+++ b/gr-channels/examples/demo_spec_an.grc
@@ -1,62 +1,63 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Thu Aug  1 13:13:07 2013</timestamp>
+  <timestamp>Wed Jul  9 15:47:18 2014</timestamp>
   <block>
-    <key>blocks_add_xx</key>
+    <key>options</key>
     <param>
       <key>id</key>
-      <value>blocks_add_xx_0</value>
+      <value>demo_spec_an</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>title</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>author</key>
+      <value>mettus</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>description</key>
       <value></value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
+      <key>window_size</key>
+      <value>1280, 1024</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(251, 344)</value>
+      <key>generate_options</key>
+      <value>qt_gui</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>category</key>
+      <value>Custom</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>fft_size</value>
+      <key>run_options</key>
+      <value>prompt</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>run</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1000</value>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(17, 84)</value>
+      <value>(0, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -78,8 +79,12 @@
       <value>100000</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 170)</value>
+      <value>(234, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -87,22 +92,26 @@
     </param>
   </block>
   <block>
-    <key>import</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>imp0</value>
+      <value>fft_size</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>import</key>
-      <value>import math</value>
+      <key>value</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(238, 60)</value>
+      <value>(151, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,10 +119,10 @@
     </param>
   </block>
   <block>
-    <key>analog_noise_source_x</key>
+    <key>blocks_rms_xx</key>
     <param>
       <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <value>blocks_rms_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -124,16 +133,12 @@
       <value>complex</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
-    </param>
-    <param>
-      <key>amp</key>
-      <value>math.pow(10.0,snr/20.0)/math.sqrt(2.0)</value>
+      <key>alpha</key>
+      <value>.0001</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>42</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -144,8 +149,12 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(16, 295)</value>
+      <value>(491, 138)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -153,54 +162,26 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>import</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>imp0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Freq_offset</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>-5*samp_rate/fft_size</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>5*samp_rate/fft_size</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>import</key>
+      <value>import math</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(314, 514)</value>
+      <value>(-1, 77)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -208,10 +189,10 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>blocks_rms_xx</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <value>blocks_rms_xx_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -222,24 +203,12 @@
       <value>complex</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
-    </param>
-    <param>
-      <key>freq</key>
-      <value>float(samp_rate)/float(fft_size)*26+freq_offset</value>
-    </param>
-    <param>
-      <key>amp</key>
-      <value>1.0</value>
+      <key>alpha</key>
+      <value>.0001</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -250,8 +219,12 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(16, 386)</value>
+      <value>(458, 301)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -259,10 +232,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>blocks_add_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>blocks_add_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -273,14 +246,18 @@
       <value>complex</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>num_inputs</key>
+      <value>2</value>
     </param>
     <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -289,8 +266,12 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(370, 357)</value>
+      <value>(244, 187)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -298,54 +279,50 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>snr</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>"Noise Level"</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-100</value>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
     </param>
     <param>
-      <key>max</key>
-      <value>100</value>
+      <key>amp</key>
+      <value>math.pow(10.0,snr/20.0)/math.sqrt(2.0)</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>200</value>
+      <key>seed</key>
+      <value>42</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(167, 510)</value>
+      <value>(11, 138)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -353,10 +330,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_rms_xx</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>blocks_rms_xx_0</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -367,8 +344,20 @@
       <value>complex</value>
     </param>
     <param>
-      <key>alpha</key>
-      <value>.0001</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -379,8 +368,12 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(491, 138)</value>
+      <value>(363, 200)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -388,285 +381,978 @@
     </param>
   </block>
   <block>
-    <key>blocks_rms_xx</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>blocks_rms_xx_0_0</value>
+      <value>qtgui_time_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
-      <value>True</value>
+      <value>False</value>
     </param>
     <param>
       <key>type</key>
       <value>complex</value>
     </param>
     <param>
-      <key>alpha</key>
-      <value>.0001</value>
+      <key>name</key>
+      <value>Scope Plot</value>
     </param>
     <param>
-      <key>affinity</key>
-      <value></value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
+      <key>srate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(465, 458)</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_divide_xx</key>
     <param>
-      <key>id</key>
-      <value>blocks_divide_xx_0</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>affinity</key>
-      <value></value>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>minoutbuf</key>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(680, 630)</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_nlog10_ff</key>
     <param>
-      <key>id</key>
-      <value>blocks_nlog10_ff_0</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>n</key>
-      <value>20</value>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(853, 100)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_divide_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_divide_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(665, 388)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_nlog10_ff</key>
+    <param>
+      <key>id</key>
+      <value>blocks_nlog10_ff_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>n</key>
+      <value>20</value>
+    </param>
+    <param>
+      <key>k</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(814, 393)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>snr</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Noise Level</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>-100</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>100</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(348, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>freq_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frequency Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>-5*samp_rate/fft_size</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>5*samp_rate/fft_size</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(487, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_sig_source_x</key>
+    <param>
+      <key>id</key>
+      <value>analog_sig_source_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
+    </param>
+    <param>
+      <key>freq</key>
+      <value>float(samp_rate)/float(fft_size)*26+freq_offset</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(12, 228)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_number_sink</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_number_sink_snr</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>avg</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>SNR</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(948, 385)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_FLATTOP</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
     </param>
     <param>
-      <key>k</key>
-      <value>0</value>
+      <key>ymax</key>
+      <value>10</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>nconnections</key>
       <value>1</value>
     </param>
     <param>
-      <key>affinity</key>
-      <value></value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(813, 640)</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_numbersink2</key>
     <param>
-      <key>id</key>
-      <value>snr_disp</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>title</key>
-      <value>SNR</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>units</key>
-      <value>dB</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>min_value</key>
-      <value>-100</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>100</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>factor</key>
-      <value>1.0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>5</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>False</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label6</key>
       <value></value>
     </param>
     <param>
-      <key>affinity</key>
-      <value></value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(907, 654)</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_numbersink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_numbersink2_0</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Noise Amplitude</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>units</key>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>min_value</key>
-      <value>-100</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>100</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>factor</key>
+      <key>alpha8</key>
       <value>1.0</value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>5</value>
-    </param>
-    <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>False</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
@@ -675,7 +1361,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(774, 46)</value>
+      <value>(853, 219)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -683,10 +1369,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2_0_0</value>
+      <value>qtgui_number_sink_signal_amplitude</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -697,147 +1383,120 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Signal Amplitude</value>
-    </param>
-    <param>
-      <key>units</key>
-      <value></value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>min_value</key>
-      <value>-100</value>
-    </param>
-    <param>
-      <key>max_value</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>factor</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>decimal_places</key>
-      <value>5</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>ref_level</key>
+      <key>avg</key>
       <value>0</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>min</key>
+      <value>0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>max</key>
+      <value>2</value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>False</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>label1</key>
+      <value>Signal Amplitude</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>color1</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(774, 452)</value>
+      <key>color2</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label3</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <key>color3</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>False</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label9</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>color10</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -845,7 +1504,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(696, 244)</value>
+      <value>(660, 286)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -853,10 +1512,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>qtgui_number_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -864,142 +1523,131 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <value>float</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>avg</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>15</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
+      <key>min</key>
       <value>0</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>max</key>
+      <value>100</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>fft_size</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>20</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>label1</key>
+      <value>Noise Amplitude</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>color1</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>win</key>
-      <value>window.flattop</value>
+      <key>color2</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>color3</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(894, 271)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
-  </block>
-  <block>
-    <key>options</key>
     <param>
-      <key>id</key>
-      <value>demo_spec_an</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>title</key>
+      <key>label7</key>
       <value></value>
     </param>
     <param>
-      <key>author</key>
-      <value>mettus</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>description</key>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>category</key>
-      <value>Custom</value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>run_options</key>
-      <value>prompt</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>run</key>
-      <value>True</value>
+      <key>color10</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(733, 2)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1007,38 +1655,38 @@
     </param>
   </block>
   <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>blocks_add_xx_0</sink_block_id>
+    <source_block_id>blocks_divide_xx_0</source_block_id>
+    <sink_block_id>blocks_nlog10_ff_0</sink_block_id>
     <source_key>0</source_key>
-    <sink_key>1</sink_key>
+    <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_noise_source_x_0</source_block_id>
-    <sink_block_id>blocks_add_xx_0</sink_block_id>
+    <source_block_id>blocks_rms_xx_0</source_block_id>
+    <sink_block_id>blocks_divide_xx_0</sink_block_id>
     <source_key>0</source_key>
-    <sink_key>0</sink_key>
+    <sink_key>1</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_add_xx_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_block_id>blocks_rms_xx_0_0</source_block_id>
+    <sink_block_id>blocks_divide_xx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_block_id>blocks_rms_xx_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_noise_source_x_0</source_block_id>
-    <sink_block_id>blocks_rms_xx_0</sink_block_id>
+    <source_block_id>blocks_rms_xx_0_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_signal_amplitude</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_rms_xx_0</source_block_id>
-    <sink_block_id>wxgui_numbersink2_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -1049,38 +1697,38 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_rms_xx_0_0</source_block_id>
-    <sink_block_id>wxgui_numbersink2_0_0</sink_block_id>
+    <source_block_id>analog_noise_source_x_0</source_block_id>
+    <sink_block_id>blocks_rms_xx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_nlog10_ff_0</source_block_id>
-    <sink_block_id>snr_disp</sink_block_id>
+    <source_block_id>blocks_add_xx_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_divide_xx_0</source_block_id>
-    <sink_block_id>blocks_nlog10_ff_0</sink_block_id>
+    <source_block_id>analog_noise_source_x_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_rms_xx_0</source_block_id>
-    <sink_block_id>blocks_divide_xx_0</sink_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>blocks_add_xx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>1</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_rms_xx_0_0</source_block_id>
-    <sink_block_id>blocks_divide_xx_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_block_id>blocks_nlog10_ff_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_snr</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-digital/examples/demod/ber_simulation.grc 
b/gr-digital/examples/demod/ber_simulation.grc
index 72d52d3..4d59390 100644
--- a/gr-digital/examples/demod/ber_simulation.grc
+++ b/gr-digital/examples/demod/ber_simulation.grc
@@ -1,59 +1,27 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Jan 14 11:20:53 2013</timestamp>
+  <timestamp>Wed Jul  9 17:52:56 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>ber_simulation</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER Simulation</value>
-    </param>
-    <param>
-      <key>author</key>
-      <value>Example</value>
-    </param>
-    <param>
-      <key>description</key>
-      <value>Adjust the noise and constellation... see what happens!</value>
-    </param>
-    <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
-    </param>
-    <param>
-      <key>category</key>
-      <value>Custom</value>
-    </param>
-    <param>
-      <key>run_options</key>
-      <value>prompt</value>
-    </param>
-    <param>
-      <key>run</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>value</key>
+      <value>100e3</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(16, 10)</value>
+      <value>(16, 308)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -61,30 +29,26 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle</value>
+      <value>const</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>(digital.constellation_bpsk(), digital.constellation_qpsk(), 
digital.constellation_8psk())</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(284, 24)</value>
+      <value>(116, 310)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -92,30 +56,26 @@
     </param>
   </block>
   <block>
-    <key>blocks_add_xx</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>blocks_add_xx</value>
+      <value>const_type</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>value</key>
+      <value>1</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(486, 151)</value>
+      <value>(18, 428)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -123,10 +83,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2</value>
+      <value>blocks_throttle</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -134,79 +94,43 @@
     </param>
     <param>
       <key>type</key>
-      <value>float</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>BER</value>
-    </param>
-    <param>
-      <key>units</key>
-      <value>%</value>
+      <value>byte</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>samples_per_second</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>min_value</key>
-      <value>0.0</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1.0</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>factor</key>
-      <value>100</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>4</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>ref_level</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
-    </param>
-    <param>
-      <key>peak_hold</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>average</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>avg_alpha</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>win_size</key>
-      <value></value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 1</value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
       <key>_coordinate</key>
-      <value>(791, 228)</value>
+      <value>(284, 24)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <block>
@@ -224,86 +148,12 @@
       <value>import math</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(18, 373)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>EbN0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Eb/N0 (dB)</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>-10</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>200</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>211</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(311, 309)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>const</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>(digital.constellation_bpsk(), digital.constellation_qpsk(), 
digital.constellation_8psk())</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(116, 310)</value>
+      <value>(18, 373)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -341,6 +191,22 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(17, 125)</value>
     </param>
@@ -376,6 +242,22 @@
       <value>42</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(16, 224)</value>
     </param>
@@ -415,39 +297,24 @@
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(240, 140)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blks2_error_rate</key>
-    <param>
-      <key>id</key>
-      <value>blks2_error_rate</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>'BER'</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>win_size</key>
-      <value>int(1e7)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>bits_per_symbol</key>
-      <value>const[const_type].bits_per_symbol()</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(720, 25)</value>
+      <value>(240, 140)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -469,6 +336,22 @@
       <value>const[const_type].base()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(618, 164)</value>
     </param>
@@ -478,74 +361,475 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>EbN0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value>Eb / N0 (dB)</value>
     </param>
     <param>
-      <key>title</key>
-      <value>"Constellation: "+str(const[const_type].arity()) + "-PSK"</value>
+      <key>value</key>
+      <value>10</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>start</key>
+      <value>-10</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>stop</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>_coordinate</key>
+      <value>(317, 281)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_label</key>
+    <param>
+      <key>id</key>
+      <value>variable_qtgui_label_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Constellation Type</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>{0: 'BPSK', 1: 'QPSK', 2: '8-PSK'}[const_type] + " - Change 
const_type for different constellation types!"</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
     <param>
-      <key>t_scale</key>
+      <key>_coordinate</key>
+      <value>(294, 413)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>id</key>
+      <value>blocks_add_xx</value>
     </param>
     <param>
-      <key>xy_mode</key>
+      <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
       <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 1, 1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(486, 151)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_const_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_const_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>"foo"</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>xmin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>xmax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>gui_hint</key>
+      <value>2,0,1,1</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>"Constellation: "+str(const[const_type].arity()) + "-PSK"</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>style5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(623, 228)</value>
+      <value>(603, 253)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -553,22 +837,46 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blks2_error_rate</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>blks2_error_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>100e3</value>
+      <key>type</key>
+      <value>'BER'</value>
+    </param>
+    <param>
+      <key>win_size</key>
+      <value>int(1e7)</value>
+    </param>
+    <param>
+      <key>bits_per_symbol</key>
+      <value>const[const_type].bits_per_symbol()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(16, 308)</value>
+      <value>(720, 25)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -576,22 +884,62 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>options</key>
     <param>
       <key>id</key>
-      <value>const_type</value>
+      <value>ber_simulation</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1</value>
+      <key>title</key>
+      <value>BER Simulation</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value>Example</value>
+    </param>
+    <param>
+      <key>description</key>
+      <value>Adjust the noise and constellation... see what happens!</value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(18, 428)</value>
+      <value>(16, 10)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -599,42 +947,142 @@
     </param>
   </block>
   <block>
-    <key>variable_static_text</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>variable_static_text_0</value>
+      <value>qtgui_number_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Constellation Type</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>value</key>
-      <value>{0: 'BPSK', 1: 'QPSK', 2: '8-PSK'}[const_type] + " - Change 
const_type for different constellation types!"</value>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>avg</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,0,1,1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>BER</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>str_converter</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>None</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label7</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>color7</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(422, 311)</value>
+      <value>(940, 26)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -642,12 +1090,6 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blks2_error_rate</source_block_id>
-    <sink_block_id>wxgui_numbersink2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blocks_throttle</source_block_id>
     <sink_block_id>blks2_error_rate</sink_block_id>
     <source_key>0</source_key>
@@ -678,12 +1120,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_add_xx</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>digital_constellation_decoder_cb_0</source_block_id>
     <sink_block_id>blks2_error_rate</sink_block_id>
     <source_key>0</source_key>
@@ -695,4 +1131,16 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_add_xx</source_block_id>
+    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blks2_error_rate</source_block_id>
+    <sink_block_id>qtgui_number_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-digital/examples/demod/digital_freq_lock.grc 
b/gr-digital/examples/demod/digital_freq_lock.grc
index 399d6a8..0b8955d 100644
--- a/gr-digital/examples/demod/digital_freq_lock.grc
+++ b/gr-digital/examples/demod/digital_freq_lock.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Tue Jan 15 14:17:18 2013</timestamp>
+  <timestamp>Tue Jul  8 23:23:18 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,6 +52,10 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(-1, 0)</value>
     </param>
@@ -64,7 +68,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sps</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +76,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>4</value>
+      <value>32000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(166, -2)</value>
+      <value>(311, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -98,8 +106,12 @@
       <value>0.35</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(231, 0)</value>
+      <value>(223, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,7 +122,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>sps</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -118,11 +130,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>32000</value>
+      <value>4</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(439, -1)</value>
+      <value>(154, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -130,54 +146,62 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>digital_psk_mod</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>digital_psk_mod_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Frequency Offset</value>
+      <key>constellation_points</key>
+      <value>2</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>mod_code</key>
+      <value>"gray"</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-0.5</value>
+      <key>differential</key>
+      <value>False</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.5</value>
+      <key>samples_per_symbol</key>
+      <value>sps</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>excess_bw</key>
+      <value>rolloff</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>verbose</key>
+      <value>False</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>log</key>
+      <value>False</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(673, -1)</value>
+      <value>(202, 142)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -185,10 +209,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>analog_random_source_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0_0</value>
+      <value>analog_random_source_x</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -196,63 +220,102 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>byte</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Frequency Corrected Signal</value>
+      <key>min</key>
+      <value>0</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>max</key>
+      <value>256</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>10000000</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>v_scale</key>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
+      <key>_coordinate</key>
+      <value>(8, 150)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>channels_channel_model</key>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>id</key>
+      <value>channels_channel_model_0</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>noise_voltage</key>
+      <value>noise_amp</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>freq_offset</key>
+      <value>freq_offset</value>
+    </param>
+    <param>
+      <key>epsilon</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>42</value>
+    </param>
+    <param>
+      <key>block_tags</key>
+      <value>False</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(439, 289)</value>
+      <value>(681, 142)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -260,10 +323,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0_0</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -274,76 +337,91 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Frequency Corrected Signal</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>_coordinate</key>
+      <value>(469, 172)</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>digital_fll_band_edge_cc</key>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>id</key>
+      <value>digital_fll_band_edge_cc_0</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>type</key>
+      <value>cc</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>samps_per_sym</key>
+      <value>sps</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>rolloff</key>
+      <value>rolloff</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>filter_size</key>
+      <value>44</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>w</key>
+      <value>freq_bw</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,0</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(439, 423)</value>
+      <value>(583, 286)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -351,10 +429,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>freq_bw</value>
+      <value>noise_amp</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -362,43 +440,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>FLL Loop Bandwidth</value>
+      <value>Channel Noise</value>
     </param>
     <param>
       <key>value</key>
       <value>0</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.1</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>step</key>
+      <value>0.01</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>gui_hint</key>
+      <value>0, 0, 1, 1</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(74, 436)</value>
+      <value>(498, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -406,73 +488,58 @@
     </param>
   </block>
   <block>
-    <key>notebook</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>notebook_0</value>
+      <value>freq_offset</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.NB_TOP</value>
-    </param>
-    <param>
-      <key>labels</key>
-      <value>['Freq', 'Time']</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
+      <key>label</key>
+      <value>Frequency Offset</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(108, 568)</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>start</key>
+      <value>-.5</value>
     </param>
-  </block>
-  <block>
-    <key>digital_fll_band_edge_cc</key>
     <param>
-      <key>id</key>
-      <value>digital_fll_band_edge_cc_0</value>
+      <key>stop</key>
+      <value>.5</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>step</key>
+      <value>0.01</value>
     </param>
     <param>
-      <key>type</key>
-      <value>cc</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>samps_per_sym</key>
-      <value>sps</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>rolloff</key>
-      <value>rolloff</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>filter_size</key>
-      <value>44</value>
+      <key>gui_hint</key>
+      <value>1, 0, 1, 1</value>
     </param>
     <param>
-      <key>w</key>
-      <value>freq_bw</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(75, 295)</value>
+      <value>(624, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -480,90 +547,109 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_tab_widget</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>notebook</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>num_tabs</key>
+      <value>2</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Signal into Receiver</value>
+      <key>label0</key>
+      <value>Frequency</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>label1</key>
+      <value>Time</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>label2</key>
+      <value>Tab 2</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>label3</key>
+      <value>Tab 3</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>label4</key>
+      <value>Tab 4</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>gui_hint</key>
+      <value>3, 0, 1, 1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>_coordinate</key>
+      <value>(0, 69)</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>id</key>
+      <value>freq_bw</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
+      <key>value</key>
       <value>0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>stop</key>
+      <value>0.1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>step</key>
+      <value>0.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,0</value>
+      <key>gui_hint</key>
+      <value>2, 0, 1, 1</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(918, 107)</value>
+      <value>(399, 290)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -571,10 +657,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -585,107 +671,798 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
+      <key>name</key>
       <value>Signal into Receiver</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>fftsize</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>fc</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>bw</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>ac_couple</key>
+      <key>autoscale</key>
       <value>False</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>average</key>
+      <value>0.1</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>ymin</key>
+      <value>-120</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>ymax</key>
+      <value>-20</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,1</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(918, 0)</value>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(931, 200)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Frequency Corrected Signal</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-120</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>-20</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(929, 436)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Frequency Corrected Signal</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label9</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>digital_psk_mod</key>
     <param>
-      <key>id</key>
-      <value>digital_psk_mod_0</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>constellation_points</key>
-      <value>2</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>mod_code</key>
-      <value>"gray"</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>differential</key>
-      <value>False</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>samples_per_symbol</key>
-      <value>sps</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>excess_bw</key>
-      <value>rolloff</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>verbose</key>
-      <value>False</value>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(202, 142)</value>
+      <value>(930, 324)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -693,10 +1470,10 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x</value>
+      <value>qtgui_time_sink_x_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -704,152 +1481,323 @@
     </param>
     <param>
       <key>type</key>
-      <value>byte</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>name</key>
+      <value>Signal into Receiver</value>
     </param>
     <param>
-      <key>max</key>
-      <value>256</value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>num_samps</key>
-      <value>10000000</value>
+      <key>srate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>repeat</key>
+      <key>autoscale</key>
       <value>True</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(8, 150)</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>channels_channel_model</key>
     <param>
-      <key>id</key>
-      <value>channels_channel_model_0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
       <value>True</value>
     </param>
     <param>
-      <key>noise_voltage</key>
-      <value>noise_amp</value>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
     </param>
     <param>
-      <key>freq_offset</key>
-      <value>freq_offset</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>epsilon</key>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
       <value>1.0</value>
     </param>
     <param>
-      <key>taps</key>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
       <value>1.0</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>42</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(681, 142)</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
     <param>
-      <key>id</key>
-      <value>blocks_throttle_0</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>width4</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(487, 174)</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style4</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>noise_amp</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Channel Noise</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>max</key>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
       <value>1.0</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(549, 0)</value>
+      <value>(928, 41)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -857,50 +1805,50 @@
     </param>
   </block>
   <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_block_id>analog_random_source_x</source_block_id>
+    <sink_block_id>digital_psk_mod_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_block_id>digital_psk_mod_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_random_source_x</source_block_id>
-    <sink_block_id>digital_psk_mod_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>channels_channel_model_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_psk_mod_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_block_id>channels_channel_model_0</source_block_id>
+    <sink_block_id>digital_fll_band_edge_cc_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>channels_channel_model_0</sink_block_id>
+    <source_block_id>channels_channel_model_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>digital_fll_band_edge_cc_0</sink_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>digital_fll_band_edge_cc_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0</sink_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>digital_fll_band_edge_cc_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_1</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-digital/examples/demod/dpsk_loopback.grc 
b/gr-digital/examples/demod/dpsk_loopback.grc
index daa076c..c0ad423 100644
--- a/gr-digital/examples/demod/dpsk_loopback.grc
+++ b/gr-digital/examples/demod/dpsk_loopback.grc
@@ -1,59 +1,51 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:13:23 2012</timestamp>
+  <timestamp>Tue Jul  8 23:26:29 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>dpsk_loopback</value>
+      <value>blocks_throttle_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>DPSK Loopback</value>
-    </param>
-    <param>
-      <key>author</key>
-      <value>GNU Radio</value>
-    </param>
-    <param>
-      <key>description</key>
-      <value>Encode a signal into a packet, modulate, demodulate, decode and 
show it's the same data.</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>category</key>
-      <value>Custom</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>run_options</key>
-      <value>prompt</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>run</key>
-      <value>True</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>max_nouts</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(381, 51)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,63 +67,12 @@
       <value>10000</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(11, 120)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Frequency (Hz)</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>500</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>samp_rate/2</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(13, 188)</value>
+      <value>(5, 115)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -139,10 +80,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>blks2_packet_encoder</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0_0</value>
+      <value>blks2_packet_encoder_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -153,54 +94,43 @@
       <value>float</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>samples_per_symbol</key>
+      <value>2</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>bits_per_symbol</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(381, 51)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>preamble</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>blks2_packet_encoder</key>
     <param>
-      <key>id</key>
-      <value>blks2_packet_encoder_0</value>
+      <key>access_code</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>pad_for_usrp</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
-    </param>
-    <param>
-      <key>samples_per_symbol</key>
-      <value>2</value>
+      <key>payload_length</key>
+      <value>0</value>
     </param>
     <param>
-      <key>bits_per_symbol</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>access_code</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>pad_for_usrp</key>
-      <value>True</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>payload_length</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
@@ -247,6 +177,22 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(806, 27)</value>
     </param>
@@ -306,6 +252,22 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(745, 139)</value>
     </param>
@@ -315,10 +277,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>blks2_packet_decoder</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>blks2_packet_decoder_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -329,60 +291,367 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>access_code</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>threshold</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>v_scale</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>1./freq</value>
+      <key>_coordinate</key>
+      <value>(545, 187)</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>xy_mode</key>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>QT GUI Plot</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
       <value>False</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>ymin</key>
+      <value>-1.1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1.1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(184, 163)</value>
+      <value>(249, 172)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -390,42 +659,121 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>500</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>freq</key>
-      <value>freq</value>
+      <key>stop</key>
+      <value>5000</value>
     </param>
     <param>
-      <key>amp</key>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
-      <key>offset</key>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(0, 187)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>dpsk_loopback</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>DPSK Loopback</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value>GNU Radio</value>
+    </param>
+    <param>
+      <key>description</key>
+      <value>Encode a signal into a packet, modulate, demodulate, decode and 
show it's the same data.</value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
     <param>
       <key>_coordinate</key>
-      <value>(190, 19)</value>
+      <value>(0, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -433,10 +781,10 @@
     </param>
   </block>
   <block>
-    <key>blks2_packet_decoder</key>
+    <key>analog_sig_source_x</key>
     <param>
       <key>id</key>
-      <value>blks2_packet_decoder_0</value>
+      <value>analog_sig_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -447,29 +795,51 @@
       <value>float</value>
     </param>
     <param>
-      <key>access_code</key>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
+    </param>
+    <param>
+      <key>freq</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>threshold</key>
-      <value>-1</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(545, 187)</value>
+      <value>(188, 23)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <connection>
-    <source_block_id>blks2_packet_decoder_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blks2_packet_encoder_0</source_block_id>
     <sink_block_id>digital_dxpsk_mod_1</sink_block_id>
     <source_key>0</source_key>
@@ -499,4 +869,10 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blks2_packet_decoder_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-digital/examples/demod/pam_sync.grc 
b/gr-digital/examples/demod/pam_sync.grc
index 98b4d4a..e3de429 100644
--- a/gr-digital/examples/demod/pam_sync.grc
+++ b/gr-digital/examples/demod/pam_sync.grc
@@ -1,59 +1,54 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Mar 17 21:08:58 2013</timestamp>
+  <timestamp>Wed Jul  9 12:32:34 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>pam_sync</value>
+      <value>sig_amp</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value></value>
-    </param>
-    <param>
-      <key>author</key>
-      <value></value>
+      <key>value</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>description</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
+      <key>_coordinate</key>
+      <value>(887, -1)</value>
     </param>
     <param>
-      <key>category</key>
-      <value>Custom</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>run_options</key>
-      <value>prompt</value>
+      <key>id</key>
+      <value>const</value>
     </param>
     <param>
-      <key>run</key>
+      <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>value</key>
+      <value>digital.qpsk_constellation()</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(-1, 0)</value>
+      <value>(336, -2)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +59,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>const</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +67,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.qpsk_constellation()</value>
+      <value>128000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(336, -2)</value>
+      <value>(193, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,22 +83,26 @@
     </param>
   </block>
   <block>
-    <key>virtual_sink</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>virtual_sink_0</value>
+      <value>spb</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>stream_id</key>
-      <value>input_signal_probe</value>
+      <key>value</key>
+      <value>4.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(330, 183)</value>
+      <value>(513, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,7 +113,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>rolloff</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -118,11 +121,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>128000</value>
+      <value>0.35</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(193, -1)</value>
+      <value>(578, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -130,38 +137,53 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x</value>
+      <value>rrctaps</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>value</key>
+      <value>firdes.root_raised_cosine(nfilts,1.0,1.0/(nfilts*spb), rolloff, 
int(11*spb*nfilts))</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>max</key>
-      <value>const.arity()</value>
+      <key>_coordinate</key>
+      <value>(660, 0)</value>
     </param>
     <param>
-      <key>num_samps</key>
-      <value>10000000</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>repeat</key>
+      <key>id</key>
+      <value>nfilts</value>
+    </param>
+    <param>
+      <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>value</key>
+      <value>32</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(0, 72)</value>
+      <value>(816, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -169,74 +191,77 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>virtual_sink</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0_0_1</value>
+      <value>virtual_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>stream_id</key>
+      <value>input_signal_probe</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Pre-sync Signal</value>
+      <key>_coordinate</key>
+      <value>(330, 183)</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>analog_random_source_x</key>
     <param>
-      <key>v_scale</key>
-      <value>.5</value>
+      <key>id</key>
+      <value>analog_random_source_x</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>type</key>
+      <value>byte</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>min</key>
+      <value>0</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>max</key>
+      <value>const.arity()</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>num_samps</key>
+      <value>10000000</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>repeat</key>
+      <value>True</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1081, 439)</value>
+      <value>(0, 72)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -244,90 +269,121 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>digital_chunks_to_symbols_xx</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
+      <key>in_type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>out_type</key>
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Received spectrum</value>
+      <key>symbol_table</key>
+      <value>const.points()</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>dimension</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>num_ports</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>_coordinate</key>
+      <value>(178, 87)</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>digital_pfb_clock_sync_xxx</key>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>id</key>
+      <value>digital_pfb_clock_sync_xxx_0</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>type</key>
+      <value>ccf</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>sps</key>
+      <value>spb</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>loop_bw</key>
+      <value>time_bw</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>taps</key>
+      <value>rrctaps</value>
+    </param>
+    <param>
+      <key>filter_size</key>
+      <value>nfilts</value>
+    </param>
+    <param>
+      <key>init_phase</key>
+      <value>16</value>
+    </param>
+    <param>
+      <key>max_dev</key>
+      <value>1.5</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>osps</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1081, 563)</value>
+      <value>(598, 241)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -335,54 +391,58 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>channels_channel_model</key>
     <param>
       <key>id</key>
-      <value>phase_bw</value>
+      <value>channels_channel_model_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Costas Loop (Phase) Bandwidth</value>
+      <key>noise_voltage</key>
+      <value>noise_amp</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>freq_offset</key>
+      <value>freq_offset</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>epsilon</key>
+      <value>interpratio</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.1</value>
+      <key>taps</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>42</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>block_tags</key>
+      <value>False</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(7,2,1,1)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(866, 313)</value>
+      <value>(59, 184)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -390,38 +450,46 @@
     </param>
   </block>
   <block>
-    <key>digital_chunks_to_symbols_xx</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>digital_chunks_to_symbols_xx</value>
+      <value>blocks_multiply_const_vxx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>byte</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>complex</value>
+      <key>const</key>
+      <value>sig_amp</value>
     </param>
     <param>
-      <key>symbol_table</key>
-      <value>const.points()</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>dimension</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(178, 87)</value>
+      <value>(807, 95)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -429,45 +497,50 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>spb</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>4.0</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(513, -1)</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>rolloff</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>0.35</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(578, -1)</value>
+      <value>(987, 95)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -475,68 +548,58 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>pfb_arb_resampler_xxx</key>
     <param>
       <key>id</key>
-      <value>rrctaps</value>
+      <value>pfb_arb_resampler_xxx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>firdes.root_raised_cosine(nfilts,1.0,1.0/(nfilts*spb), rolloff, 
int(11*spb*nfilts))</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(660, 0)</value>
+      <key>type</key>
+      <value>ccf</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>rrate</key>
+      <value>spb</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>sig_amp</value>
+      <key>taps</key>
+      <value>firdes.root_raised_cosine(nfilts, 1.0, 1.0/nfilts, rolloff, 
int(11*spb*nfilts))</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>nfilts</key>
+      <value>32</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1.0</value>
+      <key>atten</key>
+      <value>100</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(887, -1)</value>
+      <key>samp_delay</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>nfilts</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(816, 0)</value>
+      <value>(455, 72)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -544,50 +607,58 @@
     </param>
   </block>
   <block>
-    <key>digital_pfb_clock_sync_xxx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>digital_pfb_clock_sync_xxx_0</value>
+      <value>interpratio</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ccf</value>
+      <key>label</key>
+      <value>Timing Offset</value>
     </param>
     <param>
-      <key>sps</key>
-      <value>spb</value>
+      <key>value</key>
+      <value>1</value>
     </param>
     <param>
-      <key>loop_bw</key>
-      <value>time_bw</value>
+      <key>start</key>
+      <value>.99</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>rrctaps</value>
+      <key>stop</key>
+      <value>1.01</value>
     </param>
     <param>
-      <key>filter_size</key>
-      <value>nfilts</value>
+      <key>step</key>
+      <value>0.0001</value>
     </param>
     <param>
-      <key>init_phase</key>
-      <value>16</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>max_dev</key>
-      <value>1.5</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>osps</key>
-      <value>1</value>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>3,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(598, 241)</value>
+      <value>(0, 452)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -595,38 +666,58 @@
     </param>
   </block>
   <block>
-    <key>pfb_arb_resampler_xxx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>pfb_arb_resampler_xxx_0</value>
+      <value>noise_amp</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ccf</value>
+      <key>label</key>
+      <value>Channel Noise</value>
     </param>
     <param>
-      <key>rrate</key>
-      <value>spb</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>firdes.root_raised_cosine(nfilts, 1.0, 1.0/nfilts, rolloff, 
int(11*spb*nfilts))</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>nfilts</key>
-      <value>32</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>atten</key>
-      <value>100</value>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(503, 63)</value>
+      <value>(136, 317)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -634,7 +725,7 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
       <value>freq_offset</value>
@@ -652,36 +743,40 @@
       <value>0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-0.5</value>
+      <key>start</key>
+      <value>-.5</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.5</value>
+      <key>stop</key>
+      <value>.5</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.01</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(2,2,1,1)</value>
+      <key>gui_hint</key>
+      <value>2,2,1,1</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(8, 314)</value>
+      <value>(-1, 317)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -689,54 +784,50 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>qtgui_tab_widget</key>
     <param>
       <key>id</key>
-      <value>noise_amp</value>
+      <value>notebook</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Channel Noise</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
+      <key>num_tabs</key>
+      <value>2</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>label0</key>
+      <value>Synched Signal</value>
     </param>
     <param>
-      <key>max</key>
-      <value>1.0</value>
+      <key>label1</key>
+      <value>Received Signal</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>label2</key>
+      <value>Tab 2</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>label3</key>
+      <value>Tab 3</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>label4</key>
+      <value>Tab 4</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(1,2,1,1)</value>
+      <key>gui_hint</key>
+      <value>1,1,8,1</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(136, 314)</value>
+      <value>(150, 492)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -744,38 +835,58 @@
     </param>
   </block>
   <block>
-    <key>channels_channel_model</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>channels_channel_model_0</value>
+      <value>freq_bw</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>noise_voltage</key>
-      <value>noise_amp</value>
+      <key>label</key>
+      <value>FLL Bandwidth</value>
     </param>
     <param>
-      <key>freq_offset</key>
-      <value>freq_offset</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>epsilon</key>
-      <value>interpratio</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>1.0</value>
+      <key>stop</key>
+      <value>.05</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>42</value>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>4,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(59, 184)</value>
+      <value>(331, 383)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -813,8 +924,24 @@
       <value>freq_bw</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(331, 238)</value>
+      <value>(331, 237)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -822,65 +949,1007 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>freq_bw</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>FLL Bandwidth</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
+      <key>name</key>
+      <value>Post-sync Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
       <value>0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0.0</value>
+      <key>bw</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.05</value>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>0.2</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(337, 519)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_costas_loop_cc</key>
+    <param>
+      <key>id</key>
+      <value>digital_costas_loop_cc_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>w</key>
+      <value>phase_bw</value>
+    </param>
+    <param>
+      <key>order</key>
+      <value>const.arity()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(871, 225)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Post-sync Signal</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1096, 198)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>time_bw</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Timing Loop BW</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>.1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>5,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(586, 402)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>phase_bw</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Costas Loop (Phase) Bandwidth</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>.1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>7,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(844, 325)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Received Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>0.2</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>_coordinate</key>
+      <value>(1101, 481)</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>virtual_source</key>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>id</key>
+      <value>virtual_source_0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(4,2,1,1)</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>stream_id</key>
+      <value>input_signal_probe</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(335, 379)</value>
+      <value>(836, 476)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0_0</value>
+      <value>qtgui_time_sink_x_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -891,318 +1960,320 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Post-sync spectrum</value>
+      <key>name</key>
+      <value>Pre-sync Signal</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>srate</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>autoscale</key>
+      <value>True</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>entags</key>
+      <value>True</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label1</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,0</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(337, 523)</value>
+      <key>style1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>marker1</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>digital_costas_loop_cc</key>
     <param>
-      <key>id</key>
-      <value>digital_costas_loop_cc_0</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>w</key>
-      <value>phase_bw</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>order</key>
-      <value>const.arity()</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(871, 225)</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Post-sync Signal</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>True</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style4</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,0</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1103, 196)</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>virtual_source</key>
     <param>
-      <key>id</key>
-      <value>virtual_source_0</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>stream_id</key>
-      <value>input_signal_probe</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(828, 562)</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
     <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>const</key>
-      <value>sig_amp</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>style7</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(807, 95)</value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
     <param>
-      <key>id</key>
-      <value>blocks_throttle_0</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(987, 95)</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label9</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>time_bw</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Timing Loop BW</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.1</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(5,2,1,1)</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(598, 388)</value>
+      <value>(1104, 349)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1210,89 +2281,62 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>options</key>
     <param>
       <key>id</key>
-      <value>interpratio</value>
+      <value>pam_sync</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Timing Offset</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>1.00</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0.99</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>1.01</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>1000</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>title</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(3,2,1,1)</value>
+      <key>author</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>description</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(42, 459)</value>
+      <key>window_size</key>
+      <value>1280, 1024</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>generate_options</key>
+      <value>qt_gui</value>
     </param>
-  </block>
-  <block>
-    <key>notebook</key>
     <param>
-      <key>id</key>
-      <value>notebook_0</value>
+      <key>category</key>
+      <value>Custom</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>run_options</key>
+      <value>prompt</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.NB_TOP</value>
+      <key>run</key>
+      <value>True</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>['Synched Signal', 'Received Signal']</value>
+      <key>max_nouts</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(1,1,8,1)</value>
+      <key>realtime_scheduling</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(9, 601)</value>
+      <value>(-1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1318,12 +2362,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_costas_loop_cc_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>pfb_arb_resampler_xxx_0</source_block_id>
     <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
     <source_key>0</source_key>
@@ -1336,44 +2374,50 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_fll_band_edge_cc_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0_0</sink_block_id>
+    <source_block_id>analog_random_source_x</source_block_id>
+    <sink_block_id>digital_chunks_to_symbols_xx</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>virtual_source_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>channels_channel_model_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>virtual_source_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0_1</sink_block_id>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_random_source_x</source_block_id>
-    <sink_block_id>digital_chunks_to_symbols_xx</sink_block_id>
+    <source_block_id>digital_chunks_to_symbols_xx</source_block_id>
+    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>channels_channel_model_0</sink_block_id>
+    <source_block_id>digital_fll_band_edge_cc_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_block_id>digital_costas_loop_cc_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_chunks_to_symbols_xx</source_block_id>
-    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>virtual_source_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-digital/examples/demod/pam_timing.grc 
b/gr-digital/examples/demod/pam_timing.grc
index 0e4dd49..a1ddbc1 100644
--- a/gr-digital/examples/demod/pam_timing.grc
+++ b/gr-digital/examples/demod/pam_timing.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Tue Jan 15 15:21:46 2013</timestamp>
+  <timestamp>Wed Jul  9 23:37:48 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,6 +52,10 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(-1, 0)</value>
     </param>
@@ -61,38 +65,26 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x</value>
+      <value>nfilts</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>const.arity()</value>
-    </param>
-    <param>
-      <key>num_samps</key>
-      <value>10000000</value>
+      <key>value</key>
+      <value>32</value>
     </param>
     <param>
-      <key>repeat</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(-1, 163)</value>
+      <value>(562, 334)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -100,38 +92,26 @@
     </param>
   </block>
   <block>
-    <key>digital_chunks_to_symbols_xx</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>digital_chunks_to_symbols_xx</value>
+      <value>rolloff</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>byte</value>
-    </param>
-    <param>
-      <key>out_type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>symbol_table</key>
-      <value>const.points()</value>
-    </param>
-    <param>
-      <key>dimension</key>
-      <value>1</value>
+      <key>value</key>
+      <value>.35</value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(203, 178)</value>
+      <value>(482, 335)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -142,7 +122,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>const</value>
+      <value>spb</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -150,11 +130,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.qpsk_constellation()</value>
+      <value>4.2563</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(206, 116)</value>
+      <value>(300, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -162,22 +146,26 @@
     </param>
   </block>
   <block>
-    <key>import</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>import_0</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>import</key>
-      <value>from gnuradio import digital</value>
+      <key>value</key>
+      <value>32000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(-1, 61)</value>
+      <value>(267, 357)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -188,7 +176,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>spb</value>
+      <value>sig_amp</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -196,11 +184,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>4.2563</value>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(300, 0)</value>
+      <value>(791, 46)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -211,7 +203,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sig_amp</value>
+      <value>const</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -219,11 +211,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>1</value>
+      <value>digital.qpsk_constellation()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(791, 46)</value>
+      <value>(206, 116)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -231,10 +227,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>analog_random_source_x</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>analog_random_source_x</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -242,19 +238,43 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>byte</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>min</key>
+      <value>0</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>max</key>
+      <value>const.arity()</value>
+    </param>
+    <param>
+      <key>num_samps</key>
+      <value>10000000</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(258, 431)</value>
+      <value>(-1, 163)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -262,61 +282,54 @@
     </param>
   </block>
   <block>
-    <key>channels_channel_model</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>channels_channel_model_0</value>
+      <value>digital_chunks_to_symbols_xx</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>noise_voltage</key>
-      <value>noise_amp</value>
-    </param>
-    <param>
-      <key>freq_offset</key>
-      <value>freq_offset</value>
+      <key>in_type</key>
+      <value>byte</value>
     </param>
     <param>
-      <key>epsilon</key>
-      <value>interpratio</value>
+      <key>out_type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>1.0</value>
+      <key>symbol_table</key>
+      <value>const.points()</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>42</value>
+      <key>dimension</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(57, 401)</value>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>samp_rate</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32000</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(267, 357)</value>
+      <value>(203, 178)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -324,45 +337,50 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>rolloff</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>.35</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(482, 335)</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>nfilts</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>32</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(562, 335)</value>
+      <value>(258, 431)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -370,50 +388,58 @@
     </param>
   </block>
   <block>
-    <key>digital_pfb_clock_sync_xxx</key>
+    <key>channels_channel_model</key>
     <param>
       <key>id</key>
-      <value>digital_pfb_clock_sync_xxx_0</value>
+      <value>channels_channel_model_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ccf</value>
+      <key>noise_voltage</key>
+      <value>noise_amp</value>
     </param>
     <param>
-      <key>sps</key>
-      <value>spb</value>
+      <key>freq_offset</key>
+      <value>freq_offset</value>
     </param>
     <param>
-      <key>loop_bw</key>
-      <value>time_bw</value>
+      <key>epsilon</key>
+      <value>interpratio</value>
     </param>
     <param>
       <key>taps</key>
-      <value>firdes.root_raised_cosine(nfilts, nfilts*spb, 1.0, rolloff, 
44*nfilts)</value>
+      <value>1.0</value>
     </param>
     <param>
-      <key>filter_size</key>
-      <value>nfilts</value>
+      <key>seed</key>
+      <value>42</value>
     </param>
     <param>
-      <key>init_phase</key>
-      <value>16</value>
+      <key>block_tags</key>
+      <value>False</value>
     </param>
     <param>
-      <key>max_dev</key>
-      <value>1.5</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>osps</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(467, 403)</value>
+      <value>(57, 401)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -451,83 +477,1402 @@
       <value>100</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(458, 179)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
+      <key>samp_delay</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0_0_1</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(458, 179)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>from gnuradio import digital</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(-1, 61)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>sig_amp</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(760, 159)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Error</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1020, 128)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_tab_widget</key>
+    <param>
+      <key>id</key>
+      <value>notebook</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>num_tabs</key>
+      <value>4</value>
+    </param>
+    <param>
+      <key>label0</key>
+      <value>Error</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Phase</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value>Freq</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value>Resampled Signal</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value>Tab 4</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,1,5,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(485, 554)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>interpratio</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Timing Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>.99</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>1.01</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.0001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>2,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(6, 526)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>noise_amp</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Channel Noise</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.001</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>3,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(130, 528)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>freq_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frequency Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>-.5</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>.5</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>4,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(268, 527)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_1_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Phase</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1014, 622)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_pfb_clock_sync_xxx</key>
+    <param>
+      <key>id</key>
+      <value>digital_pfb_clock_sync_xxx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>ccf</value>
+    </param>
+    <param>
+      <key>sps</key>
+      <value>spb</value>
+    </param>
+    <param>
+      <key>loop_bw</key>
+      <value>time_bw</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>firdes.root_raised_cosine(nfilts, nfilts*spb, 1.0, rolloff, 
44*nfilts)</value>
+    </param>
+    <param>
+      <key>filter_size</key>
+      <value>nfilts</value>
+    </param>
+    <param>
+      <key>init_phase</key>
+      <value>16</value>
+    </param>
+    <param>
+      <key>max_dev</key>
+      <value>1.5</value>
+    </param>
+    <param>
+      <key>osps</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(467, 403)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_1_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Rate</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>title</key>
-      <value>Error</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>.5</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style8</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,3</value>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(961, 84)</value>
+      <value>(1018, 503)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -535,10 +1880,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0_0_0</value>
+      <value>qtgui_time_sink_x_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -549,135 +1894,320 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>name</key>
+      <value>Error</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden</value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>9</value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style7</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,1</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(991, 592)</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style10</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
-    </param>
-    <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1029, 243)</value>
+      <value>(1017, 378)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -685,10 +2215,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0_0</value>
+      <value>qtgui_time_sink_x_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -696,334 +2226,323 @@
     </param>
     <param>
       <key>type</key>
-      <value>float</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Error</value>
+      <key>name</key>
+      <value>Scope Plot</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>3</value>
+      <key>srate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>entags</key>
+      <value>True</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,0</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1029, 335)</value>
+      <key>tr_delay</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>tr_chan</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0_0_0_0</value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>style1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>1.25</value>
+      <key>marker1</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>style2</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>notebook_0,2</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1024, 462)</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
     <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>const</key>
-      <value>sig_amp</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>style4</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(760, 159)</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>interpratio</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Timing Offset</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1.00</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0.99</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>max</key>
-      <value>1.01</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(2,2,1,1)</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(4, 530)</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>label7</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>time_bw</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Timing Loop BW</value>
+      <key>style7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>0.1</value>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(1,2,1,1)</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label9</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(552, 4)</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>noise_amp</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Channel Noise</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>max</key>
-      <value>1.0</value>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>style10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(3,2,1,1)</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(149, 530)</value>
+      <value>(1029, 281)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1031,10 +2550,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>time_bw</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1042,78 +2561,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Frequency Offset</value>
+      <value>Timing Loop BW</value>
     </param>
     <param>
       <key>value</key>
       <value>0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-0.5</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>0.5</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>1000</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value>(4,2,1,1)</value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(293, 530)</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>stop</key>
+      <value>.1</value>
     </param>
-  </block>
-  <block>
-    <key>notebook</key>
     <param>
-      <key>id</key>
-      <value>notebook_0</value>
+      <key>step</key>
+      <value>.001</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.NB_TOP</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>['error', 'phase', 'freq', 'Resampled Signal']</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>(1,1,5,1)</value>
+      <key>gui_hint</key>
+      <value>1,2,1,1</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(443, 577)</value>
+      <value>(451, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1127,63 +2615,63 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0_0_0</sink_block_id>
-    <source_key>2</source_key>
+    <source_block_id>pfb_arb_resampler_xxx_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0_1</sink_block_id>
+    <source_block_id>digital_chunks_to_symbols_xx</source_block_id>
+    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>pfb_arb_resampler_xxx_0</source_block_id>
-    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_block_id>analog_random_source_x</source_block_id>
+    <sink_block_id>digital_chunks_to_symbols_xx</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_chunks_to_symbols_xx</source_block_id>
-    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
+    <source_block_id>channels_channel_model_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_random_source_x</source_block_id>
-    <sink_block_id>digital_chunks_to_symbols_xx</sink_block_id>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>channels_channel_model_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0_0</sink_block_id>
-    <source_key>3</source_key>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0_0</sink_block_id>
-    <source_key>1</source_key>
+    <sink_block_id>qtgui_time_sink_x_0_0</sink_block_id>
+    <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
+    <sink_block_id>qtgui_time_sink_x_1</sink_block_id>
+    <source_key>1</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
-    <source_key>0</source_key>
+    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_1_1</sink_block_id>
+    <source_key>3</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
-    <sink_block_id>channels_channel_model_0</sink_block_id>
-    <source_key>0</source_key>
+    <source_block_id>digital_pfb_clock_sync_xxx_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_1_0</sink_block_id>
+    <source_key>2</source_key>
     <sink_key>0</sink_key>
   </connection>
 </flow_graph>
diff --git a/gr-digital/examples/ofdm/ofdm_loopback.grc 
b/gr-digital/examples/ofdm/ofdm_loopback.grc
index a2c9314..fbb26ca 100644
--- a/gr-digital/examples/ofdm/ofdm_loopback.grc
+++ b/gr-digital/examples/ofdm/ofdm_loopback.grc
@@ -1,59 +1,27 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Nov  3 19:13:00 2013</timestamp>
+  <timestamp>Wed Jul  9 15:53:31 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>ofdm_loopback_example</value>
+      <value>len_tag_key</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>OFDM Loopback Example</value>
-    </param>
-    <param>
-      <key>author</key>
-      <value></value>
-    </param>
-    <param>
-      <key>description</key>
-      <value>Transmit a pre-defined signal (a complex sine) as OFDM 
packets.</value>
-    </param>
-    <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
-    </param>
-    <param>
-      <key>category</key>
-      <value>Custom</value>
-    </param>
-    <param>
-      <key>run_options</key>
-      <value>prompt</value>
-    </param>
-    <param>
-      <key>run</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>value</key>
+      <value>"packet_len"</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(0, -1)</value>
+      <value>(283, 6)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,6 +43,10 @@
       <value>100000</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(493, 7)</value>
     </param>
@@ -98,31 +70,12 @@
       <value>64</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(403, 8)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>len_tag_key</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>"packet_len"</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(283, 6)</value>
+      <value>(403, 8)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -144,6 +97,10 @@
       <value>50</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(182, 6)</value>
     </param>
@@ -183,111 +140,24 @@
       <value>1</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(5, 124)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>wxgui_fftsink2</key>
-    <param>
-      <key>id</key>
-      <value>wxgui_fftsink2_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>Rx Spectrum</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>100e3</value>
-    </param>
-    <param>
-      <key>baseband_freq</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>y_per_div</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>ref_level</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
-    </param>
-    <param>
-      <key>fft_size</key>
-      <value>1024</value>
-    </param>
-    <param>
-      <key>fft_rate</key>
-      <value>15</value>
-    </param>
-    <param>
-      <key>peak_hold</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>average</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>avg_alpha</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
-    </param>
-    <param>
-      <key>win_size</key>
-      <value></value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>freqvar</key>
-      <value>None</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
       <key>_coordinate</key>
-      <value>(51, 500)</value>
+      <value>(5, 124)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -313,6 +183,10 @@
       <value>Rx Packets</value>
     </param>
     <param>
+      <key>filter</key>
+      <value>""</value>
+    </param>
+    <param>
       <key>num_inputs</key>
       <value>1</value>
     </param>
@@ -325,6 +199,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -364,6 +242,10 @@
       <value>len_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -372,6 +254,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(282, 132)</value>
     </param>
@@ -439,33 +325,10 @@
       <value>False</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(52, 374)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_uchar_to_float</key>
-    <param>
-      <key>id</key>
-      <value>blocks_uchar_to_float_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -474,87 +337,12 @@
       <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(326, 408)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>wxgui_scopesink2</key>
-    <param>
-      <key>id</key>
-      <value>wxgui_scopesink2_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>float</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>Scope Plot</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>v_scale</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>v_offset</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>ac_couple</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>xy_mode</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>num_inputs</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>win_size</key>
-      <value></value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
-    </param>
-    <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
-    </param>
-    <param>
-      <key>affinity</key>
-      <value></value>
-    </param>
-    <param>
       <key>_coordinate</key>
-      <value>(530, 382)</value>
+      <value>(52, 374)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -624,6 +412,10 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -632,6 +424,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(557, 94)</value>
     </param>
@@ -675,6 +471,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -683,6 +483,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(453, 244)</value>
     </param>
@@ -714,7 +518,470 @@
       <value>1</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(177, 281)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>180</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Rx Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>Rx Spectrum</value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(52, 527)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>freq_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Frequency Offset (Multiples of Sub-carrier spacing)</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>-3</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>3</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(458, 518)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>noise_voltage</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Noise Amplitude</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(652, 501)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>ofdm_loopback_example</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>OFDM Loopback Example</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value>Transmit a pre-defined signal (a complex sine) as OFDM 
packets.</value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(0, -1)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_uchar_to_float</key>
+    <param>
+      <key>id</key>
+      <value>blocks_uchar_to_float_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
@@ -722,118 +989,347 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(177, 281)</value>
+      <value>(326, 408)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>qtgui_time_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Frequency Offset (Multiples of Sub-carrier spacing)</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>value</key>
+      <key>name</key>
+      <value>Scope Plot</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-3</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>3</value>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker1</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(466, 508)</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>noise_voltage</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Noise Amplitude</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0.01</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>max</key>
+      <key>style7</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(653, 505)</value>
+      <value>(550, 382)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -848,12 +1344,6 @@
   </connection>
   <connection>
     <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
     <sink_block_id>digital_ofdm_rx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
@@ -883,14 +1373,20 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_uchar_to_float_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_block_id>channels_channel_model_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>channels_channel_model_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_uchar_to_float_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-digital/examples/ofdm/rx_ofdm.grc 
b/gr-digital/examples/ofdm/rx_ofdm.grc
index 3853853..0d00567 100644
--- a/gr-digital/examples/ofdm/rx_ofdm.grc
+++ b/gr-digital/examples/ofdm/rx_ofdm.grc
@@ -1,59 +1,27 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Feb  2 14:07:51 2014</timestamp>
+  <timestamp>Wed Jul  9 15:50:17 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>rx_ofdm</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>OFDM Rx</value>
-    </param>
-    <param>
-      <key>author</key>
-      <value></value>
-    </param>
-    <param>
-      <key>description</key>
-      <value>Example of an OFDM receiver</value>
-    </param>
-    <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
-    </param>
-    <param>
-      <key>category</key>
-      <value>Custom</value>
-    </param>
-    <param>
-      <key>run_options</key>
-      <value>prompt</value>
-    </param>
-    <param>
-      <key>run</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>value</key>
+      <value>10000</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(0, -1)</value>
+      <value>(170, 65)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +32,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>payload_mod</value>
+      <value>header_formatter</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +40,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.constellation_qpsk()</value>
+      <value>digital.packet_header_ofdm(occupied_carriers, n_syms=1, 
len_tag_key=packet_length_tag_key, frame_len_tag_key=length_tag_key, 
bits_per_header_sym=header_mod.bits_per_symbol(), 
bits_per_payload_sym=payload_mod.bits_per_symbol(), 
scramble_header=False)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(663, 1)</value>
+      <value>(855, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -87,7 +59,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>packet_length_tag_key</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -95,11 +67,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>10000</value>
+      <value>"packet_len"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(170, 65)</value>
+      <value>(1132, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,7 +86,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>header_equalizer</value>
+      <value>length_tag_key</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -118,11 +94,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.ofdm_equalizer_simpledfe(fft_len, header_mod.base(), 
occupied_carriers, pilot_carriers, pilot_symbols)</value>
+      <value>"frame_len"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(931, 69)</value>
+      <value>(367, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -133,7 +113,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>payload_equalizer</value>
+      <value>occupied_carriers</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -141,11 +121,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.ofdm_equalizer_simpledfe(fft_len, payload_mod.base(), 
occupied_carriers, pilot_carriers, pilot_symbols, 1)</value>
+      <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + 
range(8, 21) + range(22, 27),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1112, 73)</value>
+      <value>(541, 70)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -156,7 +140,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sync_word2</value>
+      <value>pilot_symbols</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -164,11 +148,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>[0j, 0j, 0j, 0j, 0j, 0j, (-1+0j), (-1+0j), (-1+0j), (-1+0j), 
(1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1 
+0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), 
(-1+0j), (-1+0j), (1+0j), (-1+0j), 0j, (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), 
(-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (1+0j), 
(-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), 
(-1+0j), (-1+0j), (-1+0j), 0j, 0 [...]
+      <value>((1, 1, 1, -1,),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(399, 66)</value>
+      <value>(813, 70)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -179,7 +167,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sync_word1</value>
+      <value>pilot_carriers</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -187,11 +175,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>[0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., 
1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 
-1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 
1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 0., 0., 0., 0., 0.]</value>
+      <value>((-21, -7, 7, 21,),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(255, 67)</value>
+      <value>(692, 70)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -202,7 +194,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>fft_len</value>
+      <value>packet_len</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -210,11 +202,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>64</value>
+      <value>96</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(301, -1)</value>
+      <value>(1034, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -236,6 +232,10 @@
       <value>digital.constellation_bpsk()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(490, 0)</value>
     </param>
@@ -248,7 +248,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>packet_len</value>
+      <value>fft_len</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -256,34 +256,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>96</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(1034, 0)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>pilot_carriers</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <value>64</value>
     </param>
     <param>
-      <key>value</key>
-      <value>((-21, -7, 7, 21,),)</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(692, 70)</value>
+      <value>(301, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -294,7 +275,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>pilot_symbols</value>
+      <value>sync_word1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -302,11 +283,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>((1, 1, 1, -1,),)</value>
+      <value>[0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., 
1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 
-1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 
1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 0., 0., 0., 0., 0.]</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(813, 70)</value>
+      <value>(255, 67)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -317,7 +302,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>occupied_carriers</value>
+      <value>sync_word2</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -325,11 +310,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + 
range(8, 21) + range(22, 27),)</value>
+      <value>[0j, 0j, 0j, 0j, 0j, 0j, (-1+0j), (-1+0j), (-1+0j), (-1+0j), 
(1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1 
+0j), (1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), 
(-1+0j), (-1+0j), (1+0j), (-1+0j), 0j, (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), 
(-1+0j), (1+0j), (1+0j), (1+0j), (-1+0j), (1+0j), (1+0j), (1+0j), (1+0j), 
(-1+0j), (1+0j), (-1+0j), (-1+0j), (-1+0j), (1+0j), (-1+0j), (1+0j), (-1+0j), 
(-1+0j), (-1+0j), (-1+0j), 0j, 0 [...]
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(541, 70)</value>
+      <value>(399, 66)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -340,7 +329,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>length_tag_key</value>
+      <value>payload_equalizer</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -348,11 +337,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>"frame_len"</value>
+      <value>digital.ofdm_equalizer_simpledfe(fft_len, payload_mod.base(), 
occupied_carriers, pilot_carriers, pilot_symbols, 1)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(367, -1)</value>
+      <value>(1112, 73)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -363,7 +356,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>packet_length_tag_key</value>
+      <value>header_equalizer</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -371,11 +364,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>"packet_len"</value>
+      <value>digital.ofdm_equalizer_simpledfe(fft_len, header_mod.base(), 
occupied_carriers, pilot_carriers, pilot_symbols)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1132, 0)</value>
+      <value>(931, 69)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -386,7 +383,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>header_formatter</value>
+      <value>payload_mod</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -394,11 +391,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.packet_header_ofdm(occupied_carriers, n_syms=1, 
len_tag_key=packet_length_tag_key, frame_len_tag_key=length_tag_key, 
bits_per_header_sym=header_mod.bits_per_symbol(), 
bits_per_payload_sym=payload_mod.bits_per_symbol(), 
scramble_header=False)</value>
+      <value>digital.constellation_qpsk()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(855, 0)</value>
+      <value>(663, 1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -420,6 +421,10 @@
       <value>from gnuradio.digital.utils import tagged_streams</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(163, 0)</value>
     </param>
@@ -459,6 +464,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -494,6 +503,10 @@
       <value>-2.0/fft_len</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -541,6 +554,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -584,6 +601,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -627,6 +648,10 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -662,6 +687,10 @@
       <value>header_formatter.base()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -697,6 +726,10 @@
       <value>header_mod.base()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -752,6 +785,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -822,6 +859,10 @@
       <value>packet_length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -877,6 +918,10 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -932,6 +977,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1056,6 +1105,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1111,6 +1164,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1173,6 +1230,10 @@
       <value>packet_length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1220,6 +1281,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1255,6 +1320,10 @@
       <value>payload_mod.base()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1333,6 +1402,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1380,6 +1453,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1463,6 +1540,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1534,6 +1615,10 @@
       <value>()</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1593,6 +1678,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1652,6 +1741,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1699,6 +1792,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1719,6 +1816,69 @@
       <value>0</value>
     </param>
   </block>
+  <block>
+    <key>options</key>
+    <param>
+      <key>id</key>
+      <value>rx_ofdm</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>title</key>
+      <value>OFDM Rx</value>
+    </param>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value>Example of an OFDM receiver</value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value>1280, 1024</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
   <connection>
     <source_block_id>analog_random_source_x_0</source_block_id>
     <sink_block_id>blocks_stream_to_tagged_stream_0</sink_block_id>
diff --git a/gr-digital/examples/ofdm/tx_ofdm.grc 
b/gr-digital/examples/ofdm/tx_ofdm.grc
index 80d7f7f..368f16b 100644
--- a/gr-digital/examples/ofdm/tx_ofdm.grc
+++ b/gr-digital/examples/ofdm/tx_ofdm.grc
@@ -1,59 +1,27 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Nov  3 18:45:28 2013</timestamp>
+  <timestamp>Wed Jul  9 15:49:47 2014</timestamp>
   <block>
-    <key>options</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>tx_ofdm</value>
+      <value>sync_word2</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>OFDM Tx</value>
-    </param>
-    <param>
-      <key>author</key>
-      <value></value>
-    </param>
-    <param>
-      <key>description</key>
-      <value>Example of an OFDM Transmitter</value>
-    </param>
-    <param>
-      <key>window_size</key>
-      <value>1280, 1024</value>
-    </param>
-    <param>
-      <key>generate_options</key>
-      <value>wx_gui</value>
-    </param>
-    <param>
-      <key>category</key>
-      <value>Custom</value>
-    </param>
-    <param>
-      <key>run_options</key>
-      <value>run</value>
-    </param>
-    <param>
-      <key>run</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>max_nouts</key>
-      <value>0</value>
+      <key>value</key>
+      <value>[0, 0, 0, 0, 0, 0, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 
1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 0, 1, -1, 1, 1, 1, -1, 1, 1, 1, 
-1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 0, 0, 0, 0, 0] 
</value>
     </param>
     <param>
-      <key>realtime_scheduling</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(0, -1)</value>
+      <value>(496, 128)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +32,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sync_word1</value>
+      <value>length_tag_key</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +40,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>[0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., 
1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 
-1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 
1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 0., 0., 0., 0., 0.]</value>
+      <value>"packet_len"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(352, 128)</value>
+      <value>(352, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -87,7 +59,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>sync_word2</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -95,11 +67,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>[0, 0, 0, 0, 0, 0, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 
1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 0, 1, -1, 1, 1, 1, -1, 1, 1, 1, 
-1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 0, 0, 0, 0, 0] 
</value>
+      <value>100000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(496, 128)</value>
+      <value>(255, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,7 +86,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>pilot_symbols</value>
+      <value>rolloff</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -118,11 +94,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>((1, 1, 1, -1,),)</value>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(601, 64)</value>
+      <value>(898, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -133,7 +113,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>occupied_carriers</value>
+      <value>payload_mod</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -141,11 +121,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + 
range(8, 21) + range(22, 27),)</value>
+      <value>digital.constellation_qpsk()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(329, 64)</value>
+      <value>(734, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -156,7 +140,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>pilot_carriers</value>
+      <value>header_mod</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -164,11 +148,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>((-21, -7, 7, 21,),)</value>
+      <value>digital.constellation_bpsk()</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(480, 64)</value>
+      <value>(567, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -179,7 +167,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>header_formatter</value>
+      <value>packet_len</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -187,11 +175,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.packet_header_ofdm(occupied_carriers, 1, 
length_tag_key)</value>
+      <value>96</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(708, 64)</value>
+      <value>(476, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -213,6 +205,10 @@
       <value>64</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(181, -1)</value>
     </param>
@@ -225,7 +221,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>packet_len</value>
+      <value>header_formatter</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -233,34 +229,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>96</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(476, 0)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>header_mod</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <value>digital.packet_header_ofdm(occupied_carriers, 1, 
length_tag_key)</value>
     </param>
     <param>
-      <key>value</key>
-      <value>digital.constellation_bpsk()</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(567, 0)</value>
+      <value>(708, 64)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -271,7 +248,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>payload_mod</value>
+      <value>pilot_carriers</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -279,11 +256,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>digital.constellation_qpsk()</value>
+      <value>((-21, -7, 7, 21,),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(734, 0)</value>
+      <value>(480, 64)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -294,7 +275,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>rolloff</value>
+      <value>occupied_carriers</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -302,11 +283,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>0</value>
+      <value>(range(-26, -21) + range(-20, -7) + range(-6, 0) + range(1, 7) + 
range(8, 21) + range(22, 27),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(898, -1)</value>
+      <value>(329, 64)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -317,7 +302,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>pilot_symbols</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -325,11 +310,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>100000</value>
+      <value>((1, 1, 1, -1,),)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(255, 0)</value>
+      <value>(601, 64)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -340,7 +329,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>length_tag_key</value>
+      <value>sync_word1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -348,11 +337,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>"packet_len"</value>
+      <value>[0., 0., 0., 0., 0., 0., 0., 1.41421356, 0., -1.41421356, 0., 
1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 
-1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 
1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 
0., 1.41421356, 0., 0., 0., 0., 0., 0.]</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(352, 0)</value>
+      <value>(352, 128)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -397,6 +390,10 @@
       <value>import numpy</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(237, 93)</value>
     </param>
@@ -420,6 +417,10 @@
       <value>from gnuradio.digital.utils import tagged_streams</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(99, 93)</value>
     </param>
@@ -443,6 +444,10 @@
       <value>import random</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(3, 94)</value>
     </param>
@@ -528,6 +533,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -536,6 +545,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(212, 450)</value>
     </param>
@@ -625,6 +638,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -633,6 +650,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(414, 548)</value>
     </param>
@@ -664,6 +685,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -672,6 +697,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(209, 747)</value>
     </param>
@@ -711,6 +740,10 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -719,6 +752,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(214, 376)</value>
     </param>
@@ -758,6 +795,10 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -766,6 +807,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(13, 220)</value>
     </param>
@@ -805,6 +850,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -813,6 +862,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(510, 428)</value>
     </param>
@@ -848,6 +901,10 @@
       <value>length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -856,6 +913,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(632, 564)</value>
     </param>
@@ -887,6 +948,10 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -895,6 +960,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(372, 747)</value>
     </param>
@@ -930,6 +999,10 @@
       <value>False</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -938,6 +1011,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(710, 301)</value>
     </param>
@@ -961,6 +1038,14 @@
       <value>header_formatter.formatter()</value>
     </param>
     <param>
+      <key>len_tag_key</key>
+      <value>"packet_len"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -969,6 +1054,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(703, 242)</value>
     </param>
@@ -1004,6 +1093,10 @@
       <value>length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1012,6 +1105,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(193, 235)</value>
     </param>
@@ -1108,6 +1205,10 @@
       <value>length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1116,6 +1217,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(430, 235)</value>
     </param>
@@ -1159,6 +1264,10 @@
       <value>length_tag_key</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>affinity</key>
       <value></value>
     </param>
@@ -1167,6 +1276,10 @@
       <value>0</value>
     </param>
     <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(192, 540)</value>
     </param>
@@ -1222,70 +1335,474 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>digital_ofdm_rx</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>digital_ofdm_rx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>fft_len</key>
+      <value>fft_len</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>cp_len</key>
+      <value>fft_len/4</value>
+    </param>
+    <param>
+      <key>packet_len_key</key>
+      <value>"length"</value>
+    </param>
+    <param>
+      <key>occupied_carriers</key>
+      <value>occupied_carriers</value>
+    </param>
+    <param>
+      <key>pilot_carriers</key>
+      <value>pilot_carriers</value>
+    </param>
+    <param>
+      <key>pilot_symbols</key>
+      <value>pilot_symbols</value>
+    </param>
+    <param>
+      <key>sync_word1</key>
+      <value>sync_word1</value>
+    </param>
+    <param>
+      <key>sync_word2</key>
+      <value>sync_word2</value>
+    </param>
+    <param>
+      <key>header_mod</key>
+      <value>"BPSK"</value>
+    </param>
+    <param>
+      <key>payload_mod</key>
+      <value>"QPSK"</value>
+    </param>
+    <param>
+      <key>scramble_bits</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(439, 823)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>channels_channel_model</key>
+    <param>
+      <key>id</key>
+      <value>channels_channel_model_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>noise_voltage</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>freq_offset</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>epsilon</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>taps</key>
+      <value>1.0 + 1.0j</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>block_tags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(193, 858)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_tag_debug</key>
+    <param>
+      <key>id</key>
+      <value>blocks_tag_debug_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Rx'd Packets</value>
+    </param>
+    <param>
+      <key>filter</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>display</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(689, 889)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
+    <param>
+      <key>id</key>
+      <value>blocks_throttle_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>v_scale</key>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
+      <key>_coordinate</key>
+      <value>(559, 747)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>FFT Plot</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -1293,7 +1810,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(992, 716)</value>
+      <value>(966, 841)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1301,10 +1818,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>qtgui_time_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1315,241 +1832,312 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>name</key>
+      <value>Scope Plot</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>srate</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>autoscale</key>
+      <value>True</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>entags</key>
+      <value>True</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>label1</key>
+      <value>Scope Plot</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(994, 810)</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
-  </block>
-  <block>
-    <key>digital_ofdm_rx</key>
     <param>
-      <key>id</key>
-      <value>digital_ofdm_rx_0</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>fft_len</key>
-      <value>fft_len</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>cp_len</key>
-      <value>fft_len/4</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>packet_len_key</key>
-      <value>"length"</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>occupied_carriers</key>
-      <value>occupied_carriers</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>pilot_carriers</key>
-      <value>pilot_carriers</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>pilot_symbols</key>
-      <value>pilot_symbols</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>sync_word1</key>
-      <value>sync_word1</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>sync_word2</key>
-      <value>sync_word2</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>header_mod</key>
-      <value>"BPSK"</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>payload_mod</key>
-      <value>"QPSK"</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>scramble_bits</key>
-      <value>False</value>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(439, 823)</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>channels_channel_model</key>
     <param>
-      <key>id</key>
-      <value>channels_channel_model_0</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>noise_voltage</key>
-      <value>0.0</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>freq_offset</key>
-      <value>0.0</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>epsilon</key>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
       <value>1.0</value>
     </param>
     <param>
-      <key>taps</key>
-      <value>1.0 + 1.0j</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>seed</key>
-      <value>0</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>block_tags</key>
-      <value>True</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>affinity</key>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>minoutbuf</key>
-      <value>0</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(193, 858)</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_tag_debug</key>
     <param>
-      <key>id</key>
-      <value>blocks_tag_debug_0</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>name</key>
-      <value>Rx'd Packets</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
       <value>1</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
       <value>1</value>
     </param>
     <param>
-      <key>display</key>
-      <value>True</value>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>affinity</key>
@@ -1557,7 +2145,7 @@
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(689, 889)</value>
+      <value>(962, 714)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1565,38 +2153,62 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>options</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>tx_ofdm</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>title</key>
+      <value>OFDM Tx</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>author</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>description</key>
+      <value>Example of an OFDM Transmitter</value>
     </param>
     <param>
-      <key>affinity</key>
-      <value></value>
+      <key>window_size</key>
+      <value>1280, 1024</value>
     </param>
     <param>
-      <key>minoutbuf</key>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>Custom</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>run</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
       <value>0</value>
     </param>
     <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(559, 747)</value>
+      <value>(1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1682,18 +2294,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blocks_stream_to_tagged_stream_0</source_block_id>
     <sink_block_id>digital_crc32_bb_0</sink_block_id>
     <source_key>0</source_key>
@@ -1747,4 +2347,16 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-filter/examples/resampler_demo.grc 
b/gr-filter/examples/resampler_demo.grc
index 62ebdd3..20f6720 100644
--- a/gr-filter/examples/resampler_demo.grc
+++ b/gr-filter/examples/resampler_demo.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sun Feb 24 19:43:22 2013</timestamp>
+  <timestamp>Sat Jul 12 15:53:26 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(-2, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,8 +79,12 @@
       <value>firdes.low_pass(nphases, nphases, frac_bw, 0.5-frac_bw)</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(273, 154)</value>
+      <value>(741, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -98,8 +106,12 @@
       <value>32</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(185, 153)</value>
+      <value>(653, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -107,7 +119,34 @@
     </param>
   </block>
   <block>
-    <key>variable_static_text</key>
+    <key>import</key>
+    <param>
+      <key>id</key>
+      <value>import_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>import</key>
+      <value>import math</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(0, 74)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_label</key>
     <param>
       <key>id</key>
       <value>samp_rate</value>
@@ -118,31 +157,66 @@
     </param>
     <param>
       <key>label</key>
-      <value>Sample Rate</value>
+      <value>Sampling Rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
     </param>
     <param>
       <key>value</key>
       <value>44100</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>gui_hint</key>
+      <value>0,0,1,1</value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>None</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 1</value>
+      <key>_coordinate</key>
+      <value>(151, 0)</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_label</key>
+    <param>
+      <key>id</key>
+      <value>new_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Resampling Rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>48000</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,1,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(179, 14)</value>
+      <value>(291, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -150,10 +224,10 @@
     </param>
   </block>
   <block>
-    <key>variable_static_text</key>
+    <key>variable_qtgui_label</key>
     <param>
       <key>id</key>
-      <value>new_rate</value>
+      <value>frac_bw</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -161,31 +235,86 @@
     </param>
     <param>
       <key>label</key>
-      <value>Resampled Rate</value>
+      <value>Fractional Bandwidth</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
     </param>
     <param>
       <key>value</key>
-      <value>48000</value>
+      <value>.45</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,2,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(431, -1)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_sig_source_x</key>
+    <param>
+      <key>id</key>
+      <value>analog_sig_source_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>None</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 1, 1, 1</value>
+      <key>waveform</key>
+      <value>analog.GR_TRI_WAVE</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>freq</key>
+      <value>0.05</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(328, 15)</value>
+      <value>(4, 137)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -193,42 +322,46 @@
     </param>
   </block>
   <block>
-    <key>variable_static_text</key>
+    <key>blocks_add_const_vxx</key>
     <param>
       <key>id</key>
-      <value>frac_bw</value>
+      <value>adder</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Fractional Bandwidth</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0.45</value>
+      <key>const</key>
+      <value>-1.0</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>lambda x: "%0.2f"%x</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0,2,1,1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(473, 14)</value>
+      <value>(223, 167)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -266,31 +399,28 @@
       <value>100</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(649, 469)</value>
+      <key>samp_delay</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>analog_frequency_modulator_fc</key>
     <param>
-      <key>id</key>
-      <value>analog_frequency_modulator_fc_0</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>sensitivity</key>
-      <value>math.pi</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(429, 501)</value>
+      <value>(772, 232)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -298,101 +428,100 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>analog_frequency_modulator_fc</key>
     <param>
       <key>id</key>
-      <value>orig_fft</value>
+      <value>analog_frequency_modulator_fc_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>sensitivity</key>
+      <value>math.pi</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Original Spectrum</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
-    </param>
-    <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>30</value>
+      <key>_coordinate</key>
+      <value>(578, 167)</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>id</key>
+      <value>throttle</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 3</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(414, 279)</value>
+      <value>(386, 167)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>180</value>
+      <value>0</value>
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>resamp_fft</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -403,204 +532,224 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Resampled Spectrum</value>
+      <key>name</key>
+      <value>Spectrum</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>new_rate</value>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>fc</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>bw</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>y_divs</key>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
       <value>10</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>30</value>
+      <key>nconnections</key>
+      <value>2</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>label1</key>
+      <value>Original Spectrum</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>True</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>label2</key>
+      <value>Resampled Spectrum</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 1, 3</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(645, 241)</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>180</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_add_const_vxx</key>
     <param>
-      <key>id</key>
-      <value>adder</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>const</key>
-      <value>-1.0</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(227, 303)</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
-  </block>
-  <block>
-    <key>analog_sig_source_x</key>
     <param>
-      <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_TRI_WAVE</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>freq</key>
-      <value>0.05</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>2</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(36, 271)</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>import</key>
     <param>
-      <key>id</key>
-      <value>import_0</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>import</key>
-      <value>import math</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(11, 75)</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
     <param>
-      <key>id</key>
-      <value>throttle</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(227, 492)</value>
+      <value>(1059, 161)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -608,38 +757,38 @@
     </param>
   </block>
   <connection>
-    <source_block_id>adder</source_block_id>
-    <sink_block_id>throttle</sink_block_id>
+    <source_block_id>throttle</source_block_id>
+    <sink_block_id>analog_frequency_modulator_fc_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>pfb_arb_resampler_xxx_0</source_block_id>
-    <sink_block_id>resamp_fft</sink_block_id>
+    <source_block_id>analog_frequency_modulator_fc_0</source_block_id>
+    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>throttle</source_block_id>
-    <sink_block_id>analog_frequency_modulator_fc_0</sink_block_id>
+    <source_block_id>pfb_arb_resampler_xxx_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
-    <sink_key>0</sink_key>
+    <sink_key>1</sink_key>
   </connection>
   <connection>
     <source_block_id>analog_frequency_modulator_fc_0</source_block_id>
-    <sink_block_id>pfb_arb_resampler_xxx_0</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_frequency_modulator_fc_0</source_block_id>
-    <sink_block_id>orig_fft</sink_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>adder</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>adder</sink_block_id>
+    <source_block_id>adder</source_block_id>
+    <sink_block_id>throttle</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-trellis/examples/grc/interference_cancellation.grc 
b/gr-trellis/examples/grc/interference_cancellation.grc
index 1c42a72..ef011c5 100644
--- a/gr-trellis/examples/grc/interference_cancellation.grc
+++ b/gr-trellis/examples/grc/interference_cancellation.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:39:57 2012</timestamp>
+  <timestamp>Sat Jul 12 17:33:47 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(0, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -61,54 +65,26 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>alpha</value>
+      <value>prefix</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>P1/P</value>
-    </param>
-    <param>
       <key>value</key>
-      <value>0.6</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
+      <value>"~/src/gnuradio/"</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(243, 11)</value>
+      <value>(871, 14)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -116,54 +92,26 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>snr_db</value>
+      <value>noisevar</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>P/sigma^2 (dB)</value>
-    </param>
-    <param>
       <key>value</key>
-      <value>16</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>20</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
+      <value>10**(-snr_db/10)</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(447, 14)</value>
+      <value>(637, 13)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -174,7 +122,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>noisevar</value>
+      <value>R</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -182,11 +130,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>10**(-snr_db/10)</value>
+      <value>100e3</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(637, 13)</value>
+      <value>(748, 12)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -224,6 +176,22 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(21, 170)</value>
     </param>
@@ -263,6 +231,22 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(25, 291)</value>
     </param>
@@ -275,7 +259,7 @@
     <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_0</value>
+      <value>blocks_sub_xx_3</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -294,8 +278,24 @@
       <value>2</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(536, 529)</value>
+      <value>(535, 792)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -306,7 +306,7 @@
     <key>blocks_multiply_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_xx_0</value>
+      <value>blocks_multiply_xx_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -325,35 +325,24 @@
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(771, 525)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_short_to_float</key>
-    <param>
-      <key>id</key>
-      <value>blocks_short_to_float_0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(994, 545)</value>
+      <value>(785, 779)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -364,7 +353,7 @@
     <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_3</value>
+      <value>blocks_sub_xx_2</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -372,7 +361,7 @@
     </param>
     <param>
       <key>type</key>
-      <value>short</value>
+      <value>complex</value>
     </param>
     <param>
       <key>vlen</key>
@@ -383,8 +372,24 @@
       <value>2</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(535, 792)</value>
+      <value>(944, 978)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -392,10 +397,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_multiply_xx</key>
+    <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_xx_1</value>
+      <value>blocks_sub_xx_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -406,43 +411,32 @@
       <value>short</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
-    </param>
-    <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(785, 779)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>num_inputs</key>
+      <value>2</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_short_to_float</key>
     <param>
-      <key>id</key>
-      <value>blocks_short_to_float_2</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1005, 798)</value>
+      <value>(540, 1141)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -453,7 +447,7 @@
     <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_2</value>
+      <value>blocks_sub_xx_2_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -472,8 +466,24 @@
       <value>2</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(944, 978)</value>
+      <value>(975, 1342)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -484,7 +494,7 @@
     <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_1</value>
+      <value>blocks_sub_xx_1_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -503,8 +513,24 @@
       <value>2</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(540, 1141)</value>
+      <value>(559, 1536)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -515,7 +541,7 @@
     <key>blocks_multiply_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_xx_2</value>
+      <value>blocks_multiply_xx_2_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -534,8 +560,24 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(796, 1136)</value>
+      <value>(771, 1530)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -543,26 +585,46 @@
     </param>
   </block>
   <block>
-    <key>blocks_short_to_float</key>
+    <key>blocks_add_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_short_to_float_1</value>
+      <value>blocks_add_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1009, 1156)</value>
+      <value>(1224, 245)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -570,10 +632,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_sub_xx</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_2_0</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -584,16 +646,36 @@
       <value>complex</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>amp</key>
+      <value>noisevar</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>-42</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(975, 1342)</value>
+      <value>(1178, 321)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -601,10 +683,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_sub_xx</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_1_0</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -615,16 +697,36 @@
       <value>short</value>
     </param>
     <param>
+      <key>samples_per_second</key>
+      <value>R</value>
+    </param>
+    <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(559, 1536)</value>
+      <value>(579, 143)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -632,10 +734,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_multiply_xx</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_xx_2_0</value>
+      <value>blocks_multiply_const_vxx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -643,46 +745,35 @@
     </param>
     <param>
       <key>type</key>
-      <value>short</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>const</key>
+      <value>alpha**0.5</value>
     </param>
     <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(771, 1530)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_short_to_float</key>
-    <param>
-      <key>id</key>
-      <value>blocks_short_to_float_1_0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1010, 1551)</value>
+      <value>(988, 196)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -690,54 +781,54 @@
     </param>
   </block>
   <block>
-    <key>trellis_viterbi_combined_xx</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>trellis_viterbi_combined_xx_1</value>
+      <value>digital_chunks_to_symbols_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>c</value>
+      <key>in_type</key>
+      <value>short</value>
     </param>
     <param>
       <key>out_type</key>
-      <value>s</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <key>symbol_table</key>
+      <value>1,1j,-1j,-1</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>1000</value>
+      <key>dimension</key>
+      <value>1</value>
     </param>
     <param>
-      <key>init_state</key>
-      <value>-1</value>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
-      <key>final_state</key>
-      <value>-1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>dim</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>table</key>
-      
<value>alpha**0.5*1,alpha**0.5*1j,alpha**0.5*(-1j),alpha**0.5*(-1)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(79, 501)</value>
+      <value>(703, 211)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -745,10 +836,10 @@
     </param>
   </block>
   <block>
-    <key>trellis_viterbi_combined_xx</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>trellis_viterbi_combined_xx_2</value>
+      <value>blocks_multiply_const_vxx_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -756,43 +847,35 @@
     </param>
     <param>
       <key>type</key>
-      <value>c</value>
-    </param>
-    <param>
-      <key>out_type</key>
-      <value>s</value>
-    </param>
-    <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>1000</value>
+      <key>const</key>
+      <value>(1-alpha)**0.5</value>
     </param>
     <param>
-      <key>init_state</key>
-      <value>-1</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>final_state</key>
-      <value>-1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>dim</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>table</key>
-      
<value>(1-alpha)**0.5*1,(1-alpha)**0.5*1j,(1-alpha)**0.5*(-1j),(1-alpha)**0.5*(-1)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(82, 766)</value>
+      <value>(994, 319)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -800,54 +883,54 @@
     </param>
   </block>
   <block>
-    <key>trellis_viterbi_combined_xx</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>trellis_viterbi_combined_xx_0</value>
+      <value>digital_chunks_to_symbols_xx_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>c</value>
+      <key>in_type</key>
+      <value>short</value>
     </param>
     <param>
       <key>out_type</key>
-      <value>s</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <key>symbol_table</key>
+      <value>1,1j,-1j,-1</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>1000</value>
+      <key>dimension</key>
+      <value>1</value>
     </param>
     <param>
-      <key>init_state</key>
-      <value>-1</value>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
-      <key>final_state</key>
-      <value>-1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>dim</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>table</key>
-      
<value>(1-alpha)**0.5*1,(1-alpha)**0.5*1j,(1-alpha)**0.5*(-1j),(1-alpha)**0.5*(-1)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(83, 1111)</value>
+      <value>(703, 311)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -855,54 +938,54 @@
     </param>
   </block>
   <block>
-    <key>trellis_viterbi_combined_xx</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>trellis_viterbi_combined_xx_0_0</value>
+      <value>digital_chunks_to_symbols_xx_0_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>c</value>
+      <key>in_type</key>
+      <value>short</value>
     </param>
     <param>
       <key>out_type</key>
-      <value>s</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <key>symbol_table</key>
+      <value>1,1j,-1j,-1</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>1000</value>
+      <key>dimension</key>
+      <value>1</value>
     </param>
     <param>
-      <key>init_state</key>
-      <value>-1</value>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
-      <key>final_state</key>
-      <value>-1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>dim</key>
-      <value>1</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>table</key>
-      
<value>alpha**0.5*1,alpha**0.5*1j,alpha**0.5*(-1j),alpha**0.5*(-1)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(75, 1495)</value>
+      <value>(418, 1000)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -910,10 +993,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>blocks_multiply_const_vxx_2</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -924,60 +1007,32 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>R</value>
-    </param>
-    <param>
-      <key>v_scale</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>v_offset</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>t_scale</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>ac_couple</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>xy_mode</key>
-      <value>True</value>
+      <key>const</key>
+      <value>alpha**0.5</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
-    </param>
-    <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1533, 149)</value>
+      <value>(710, 1008)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -985,22 +1040,243 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>blocks_multiply_const_vxx</key>
     <param>
       <key>id</key>
-      <value>prefix</value>
+      <value>blocks_multiply_const_vxx_2_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>"/n/harrisville/x/anastas/gnuradio_trunk/"</value>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>const</key>
+      <value>(1-alpha)**0.5</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(871, 14)</value>
+      <value>(733, 1374)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_chunks_to_symbols_xx</key>
+    <param>
+      <key>id</key>
+      <value>digital_chunks_to_symbols_xx_0_0_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>in_type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>out_type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>symbol_table</key>
+      <value>1,1j,-1j,-1</value>
+    </param>
+    <param>
+      <key>dimension</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>num_ports</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(420, 1366)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>trellis_viterbi_combined_xx</key>
+    <param>
+      <key>id</key>
+      <value>trellis_viterbi_combined_xx_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>c</value>
+    </param>
+    <param>
+      <key>out_type</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>dim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>table</key>
+      
<value>alpha**0.5*1,alpha**0.5*1j,alpha**0.5*(-1j),alpha**0.5*(-1)</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(80, 501)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>trellis_viterbi_combined_xx</key>
+    <param>
+      <key>id</key>
+      <value>trellis_viterbi_combined_xx_2</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>c</value>
+    </param>
+    <param>
+      <key>out_type</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>dim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>table</key>
+      
<value>(1-alpha)**0.5*1,(1-alpha)**0.5*1j,(1-alpha)**0.5*(-1j),(1-alpha)**0.5*(-1)</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(82, 766)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1023,13 +1299,29 @@
     </param>
     <param>
       <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
     </param>
     <param>
       <key>init_state</key>
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(340, 187)</value>
     </param>
@@ -1039,22 +1331,46 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>trellis_encoder_xx</key>
     <param>
       <key>id</key>
-      <value>R</value>
+      <value>trellis_encoder_xx_1</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>100e3</value>
+      <key>type</key>
+      <value>ss</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(748, 12)</value>
+      <value>(336, 311)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1062,10 +1378,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>trellis_encoder_xx</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2_0</value>
+      <value>trellis_encoder_xx_2</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1073,75 +1389,925 @@
     </param>
     <param>
       <key>type</key>
-      <value>float</value>
+      <value>ss</value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER 1 (raw)</value>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(89, 1000)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>trellis_encoder_xx</key>
+    <param>
+      <key>id</key>
+      <value>trellis_encoder_xx_2_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>ss</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(103, 1366)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>trellis_viterbi_combined_xx</key>
+    <param>
+      <key>id</key>
+      <value>trellis_viterbi_combined_xx_0_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>c</value>
+    </param>
+    <param>
+      <key>out_type</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>dim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>table</key>
+      
<value>alpha**0.5*1,alpha**0.5*1j,alpha**0.5*(-1j),alpha**0.5*(-1)</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(75, 1494)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>trellis_viterbi_combined_xx</key>
+    <param>
+      <key>id</key>
+      <value>trellis_viterbi_combined_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>c</value>
+    </param>
+    <param>
+      <key>out_type</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_16.fsm"</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>init_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>dim</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>table</key>
+      
<value>(1-alpha)**0.5*1,(1-alpha)**0.5*1j,(1-alpha)**0.5*(-1j),(1-alpha)**0.5*(-1)</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(83, 1111)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_add_xx_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1400, 262)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_const_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_const_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Constellation</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>xmin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>xmax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1523, 255)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_sub_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_sub_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(554, 464)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(773, 473)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_short_to_float</key>
+    <param>
+      <key>id</key>
+      <value>blocks_short_to_float_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(925, 486)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_short_to_float</key>
+    <param>
+      <key>id</key>
+      <value>blocks_short_to_float_2</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>scale</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1010, 769)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_number_sink</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_number_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>avg</key>
+      <value>0.001</value>
+    </param>
+    <param>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,0,1,1</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value>BER 1 (raw)</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>units</key>
-      <value>BER</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>R</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>min_value</key>
-      <value>0</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>factor</key>
-      <value>1.0</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>6</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>average</key>
-      <value>True</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0.001</value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>True</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>color10</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0,0,1,1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1267, 410)</value>
+      <value>(1153, 436)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1149,10 +2315,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2_2</value>
+      <value>qtgui_number_sink_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1163,159 +2329,128 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER 2 (raw)</value>
-    </param>
-    <param>
-      <key>units</key>
-      <value>BER</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>R</value>
-    </param>
-    <param>
-      <key>min_value</key>
-      <value>0</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1.0</value>
+      <key>avg</key>
+      <value>0.001</value>
     </param>
     <param>
-      <key>factor</key>
-      <value>1.0</value>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>6</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>min</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>max</key>
+      <value>1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>average</key>
-      <value>True</value>
+      <key>gui_hint</key>
+      <value>0,1,1,1</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0.001</value>
+      <key>label1</key>
+      <value>BER 2 (raw)</value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>True</value>
+      <key>color1</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0,1,1,1</value>
+      <key>color2</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1260, 659)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>wxgui_numbersink2</key>
-    <param>
-      <key>id</key>
-      <value>wxgui_numbersink2_3</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color3</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER 2 (after cancelling user 1)</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>units</key>
-      <value>BER</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>R</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>min_value</key>
-      <value>0</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1.0</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>factor</key>
-      <value>1.0</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>6</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>average</key>
-      <value>True</value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0.001</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>True</value>
+      <key>color10</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1,1,1,1</value>
-    </param>
-    <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1262, 1020)</value>
+      <value>(1260, 719)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1323,10 +2458,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2_3_0</value>
+      <value>qtgui_number_sink_0_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1337,134 +2472,128 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER 1 (after cancelling user 2)</value>
-    </param>
-    <param>
-      <key>units</key>
-      <value>BER</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>R</value>
+      <key>avg</key>
+      <value>0.001</value>
     </param>
     <param>
-      <key>min_value</key>
-      <value>0</value>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1.0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>factor</key>
-      <value>1.0</value>
+      <key>min</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>decimal_places</key>
-      <value>6</value>
+      <key>max</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
+      <key>gui_hint</key>
+      <value>1,1,1,1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>label1</key>
+      <value>BER 2 (after cancelling user 1)</value>
     </param>
     <param>
-      <key>average</key>
-      <value>True</value>
+      <key>color1</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0.001</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>show_gauge</key>
-      <value>True</value>
+      <key>color2</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1,0,1,1</value>
+      <key>color3</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1269, 1417)</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label5</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>blocks_add_xx</key>
     <param>
-      <key>id</key>
-      <value>blocks_add_xx_1</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1400, 262)</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_add_xx</key>
     <param>
-      <key>id</key>
-      <value>blocks_add_xx_0</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>color10</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1224, 245)</value>
+      <value>(1221, 1116)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1472,34 +2601,42 @@
     </param>
   </block>
   <block>
-    <key>analog_noise_source_x</key>
+    <key>blocks_short_to_float</key>
     <param>
       <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <value>blocks_short_to_float_1</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
+      <key>scale</key>
+      <value>1</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>noisevar</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>seed</key>
-      <value>-42</value>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1178, 321)</value>
+      <value>(1006, 1153)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1507,10 +2644,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>blocks_multiply_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>blocks_multiply_xx_2</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1521,47 +2658,32 @@
       <value>short</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>R</value>
+      <key>num_inputs</key>
+      <value>2</value>
     </param>
     <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(579, 143)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
-    <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>const</key>
-      <value>alpha**0.5</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(988, 196)</value>
+      <value>(796, 1136)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1569,69 +2691,42 @@
     </param>
   </block>
   <block>
-    <key>digital_chunks_to_symbols_xx</key>
+    <key>blocks_short_to_float</key>
     <param>
       <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0</value>
+      <value>blocks_short_to_float_1_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
-    </param>
-    <param>
-      <key>out_type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>symbol_table</key>
-      <value>1,1j,-1j,-1</value>
-    </param>
-    <param>
-      <key>dimension</key>
+      <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_ports</key>
+      <key>scale</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(703, 211)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
-    <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_1</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>affinity</key>
+      <value></value>
     </param>
-    <param>
-      <key>const</key>
-      <value>(1-alpha)**0.5</value>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(994, 319)</value>
+      <value>(1008, 1549)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1639,10 +2734,10 @@
     </param>
   </block>
   <block>
-    <key>trellis_encoder_xx</key>
+    <key>qtgui_number_sink</key>
     <param>
       <key>id</key>
-      <value>trellis_encoder_xx_1</value>
+      <value>qtgui_number_sink_0_0_0_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1650,128 +2745,131 @@
     </param>
     <param>
       <key>type</key>
-      <value>ss</value>
+      <value>float</value>
     </param>
     <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>init_state</key>
-      <value>0</value>
+      <key>avg</key>
+      <value>0.001</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(336, 311)</value>
+      <key>graph_type</key>
+      <value>qtgui.NUM_GRAPH_HORIZ</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>digital_chunks_to_symbols_xx</key>
     <param>
-      <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0_0</value>
+      <key>min</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>max</key>
+      <value>1</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>complex</value>
+      <key>gui_hint</key>
+      <value>1,0,1,1</value>
     </param>
     <param>
-      <key>symbol_table</key>
-      <value>1,1j,-1j,-1</value>
+      <key>label1</key>
+      <value>BER 1 (after cancelling user 2)</value>
     </param>
     <param>
-      <key>dimension</key>
-      <value>1</value>
+      <key>color1</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(703, 311)</value>
+      <key>color2</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label3</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>digital_chunks_to_symbols_xx</key>
     <param>
-      <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0_0_0</value>
+      <key>color3</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
+      <key>color4</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>complex</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>symbol_table</key>
-      <value>1,1j,-1j,-1</value>
+      <key>color5</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>dimension</key>
-      <value>1</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>color6</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(418, 1000)</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color7</key>
+      <value>("black", "black")</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
     <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_2</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color8</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>const</key>
-      <value>alpha**0.5</value>
+      <key>color9</key>
+      <value>("black", "black")</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>("black", "black")</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(710, 1008)</value>
+      <value>(1271, 1507)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1779,61 +2877,58 @@
     </param>
   </block>
   <block>
-    <key>trellis_encoder_xx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>trellis_encoder_xx_2</value>
+      <value>alpha</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ss</value>
+      <key>label</key>
+      <value>P2/P</value>
     </param>
     <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
+      <key>value</key>
+      <value>.6</value>
     </param>
     <param>
-      <key>init_state</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(89, 1000)</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>step</key>
+      <value>.01</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_multiply_const_vxx</key>
     <param>
-      <key>id</key>
-      <value>blocks_multiply_const_vxx_2_0</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>const</key>
-      <value>(1-alpha)**0.5</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(733, 1374)</value>
+      <value>(164, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1841,69 +2936,58 @@
     </param>
   </block>
   <block>
-    <key>trellis_encoder_xx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>trellis_encoder_xx_2_0</value>
+      <value>snr_db</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>ss</value>
-    </param>
-    <param>
-      <key>fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_16.fsm"</value>
-    </param>
-    <param>
-      <key>init_state</key>
-      <value>0</value>
+      <key>label</key>
+      <value>P/sigma^2 (dB)</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(103, 1366)</value>
+      <key>value</key>
+      <value>16</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>start</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>digital_chunks_to_symbols_xx</key>
     <param>
-      <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0_0_1</value>
+      <key>stop</key>
+      <value>20</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>complex</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>symbol_table</key>
-      <value>1,1j,-1j,-1</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>dimension</key>
-      <value>1</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(420, 1366)</value>
+      <value>(310, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1953,12 +3037,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_short_to_float_0</source_block_id>
-    <sink_block_id>wxgui_numbersink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blocks_multiply_xx_2</source_block_id>
     <sink_block_id>blocks_short_to_float_1</sink_block_id>
     <source_key>0</source_key>
@@ -1971,12 +3049,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_add_xx_1</source_block_id>
-    <sink_block_id>trellis_viterbi_combined_xx_1</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>analog_random_source_x_0</source_block_id>
     <sink_block_id>blocks_sub_xx_0</sink_block_id>
     <source_key>0</source_key>
@@ -2007,12 +3079,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_sub_xx_1</source_block_id>
-    <sink_block_id>blocks_multiply_xx_2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>1</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blocks_sub_xx_2</source_block_id>
     <sink_block_id>trellis_viterbi_combined_xx_0</sink_block_id>
     <source_key>0</source_key>
@@ -2043,12 +3109,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_short_to_float_2</source_block_id>
-    <sink_block_id>wxgui_numbersink2_2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>trellis_viterbi_combined_xx_2</source_block_id>
     <sink_block_id>blocks_sub_xx_3</sink_block_id>
     <source_key>0</source_key>
@@ -2067,24 +3127,12 @@
     <sink_key>1</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_add_xx_1</source_block_id>
-    <sink_block_id>trellis_viterbi_combined_xx_2</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>analog_random_source_x_1</source_block_id>
     <sink_block_id>blocks_sub_xx_3</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_short_to_float_1</source_block_id>
-    <sink_block_id>wxgui_numbersink2_3</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>trellis_viterbi_combined_xx_2</source_block_id>
     <sink_block_id>trellis_encoder_xx_2_0</sink_block_id>
     <source_key>0</source_key>
@@ -2121,12 +3169,6 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_short_to_float_1_0</source_block_id>
-    <sink_block_id>wxgui_numbersink2_3_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>blocks_add_xx_1</source_block_id>
     <sink_block_id>blocks_sub_xx_2_0</sink_block_id>
     <source_key>0</source_key>
@@ -2145,12 +3187,6 @@
     <sink_key>1</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_add_xx_1</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>trellis_encoder_xx_0</source_block_id>
     <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
@@ -2210,4 +3246,52 @@
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_add_xx_1</source_block_id>
+    <sink_block_id>trellis_viterbi_combined_xx_1</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_add_xx_1</source_block_id>
+    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_add_xx_1</source_block_id>
+    <sink_block_id>trellis_viterbi_combined_xx_2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_float_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_float_2</source_block_id>
+    <sink_block_id>qtgui_number_sink_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_float_1</source_block_id>
+    <sink_block_id>qtgui_number_sink_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_sub_xx_1</source_block_id>
+    <sink_block_id>blocks_multiply_xx_2</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>1</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_short_to_float_1_0</source_block_id>
+    <sink_block_id>qtgui_number_sink_0_0_0_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-trellis/examples/grc/pccc.grc b/gr-trellis/examples/grc/pccc.grc
index 3563f2f..f95d8ae 100644
--- a/gr-trellis/examples/grc/pccc.grc
+++ b/gr-trellis/examples/grc/pccc.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Thu Dec 27 13:49:53 2012</timestamp>
+  <timestamp>Sat Jul 12 17:37:36 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -52,6 +52,10 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(10, 10)</value>
     </param>
@@ -64,7 +68,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>noisevar</value>
+      <value>prefix</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +76,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>10**(-snr_db/10)</value>
+      <value>"/home/mbant/src/gnuradio/"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(389, 15)</value>
+      <value>(590, 15)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -87,7 +95,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>prefix</value>
+      <value>R</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -95,11 +103,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>"/n/harrisville/x/anastas/gnuradio_trunk/"</value>
+      <value>100e3</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(590, 15)</value>
+      <value>(482, 17)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -121,6 +133,10 @@
       <value>1000</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(764, 16)</value>
     </param>
@@ -130,6 +146,33 @@
     </param>
   </block>
   <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>noisevar</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>10**(-snr_db/10)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(389, 15)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
     <key>variable_slider</key>
     <param>
       <key>id</key>
@@ -176,6 +219,10 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(229, 13)</value>
     </param>
@@ -207,35 +254,24 @@
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(392, 591)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>blocks_short_to_float</key>
-    <param>
-      <key>id</key>
-      <value>blocks_short_to_float_1_0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>scale</key>
-      <value>1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(535, 609)</value>
+      <value>(392, 591)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -243,86 +279,42 @@
     </param>
   </block>
   <block>
-    <key>wxgui_numbersink2</key>
+    <key>blocks_short_to_float</key>
     <param>
       <key>id</key>
-      <value>wxgui_numbersink2_3_0</value>
+      <value>blocks_short_to_float_1_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>BER</value>
+      <key>scale</key>
+      <value>1</value>
     </param>
     <param>
-      <key>units</key>
-      <value>BER</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>R</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>min_value</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>max_value</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>factor</key>
-      <value>1.0</value>
-    </param>
-    <param>
-      <key>decimal_places</key>
-      <value>6</value>
-    </param>
-    <param>
-      <key>ref_level</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>number_rate</key>
-      <value>15</value>
-    </param>
-    <param>
-      <key>peak_hold</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>average</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>avg_alpha</key>
-      <value>0.001</value>
-    </param>
-    <param>
-      <key>show_gauge</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>win_size</key>
-      <value></value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value>1,0,1,1</value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
       <key>_coordinate</key>
-      <value>(713, 426)</value>
+      <value>(535, 609)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -396,6 +388,14 @@
       <value>Counts</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(952, 73)</value>
     </param>
@@ -435,6 +435,22 @@
       <value>True</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(21, 170)</value>
     </param>
@@ -444,10 +460,10 @@
     </param>
   </block>
   <block>
-    <key>trellis_pccc_encoder_xx</key>
+    <key>blocks_sub_xx</key>
     <param>
       <key>id</key>
-      <value>trellis_pccc_encoder_xx_0</value>
+      <value>blocks_sub_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -455,35 +471,35 @@
     </param>
     <param>
       <key>type</key>
-      <value>ss</value>
+      <value>short</value>
     </param>
     <param>
-      <key>o_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>o_init_state</key>
-      <value>0</value>
+      <key>num_inputs</key>
+      <value>2</value>
     </param>
     <param>
-      <key>i_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>i_init_state</key>
-      <value>0</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>interleaver_args</key>
-      <value>trellis.interleaver(block,666)</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>bl</key>
-      <value>block</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(236, 147)</value>
+      <value>(217, 597)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -491,22 +507,50 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>R</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>100e3</value>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>noisevar</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>-42</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(482, 17)</value>
+      <value>(584, 259)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -514,10 +558,10 @@
     </param>
   </block>
   <block>
-    <key>trellis_pccc_decoder_combined_xx</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>trellis_pccc_decoder_combined_xx_0</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -525,71 +569,94 @@
     </param>
     <param>
       <key>type</key>
-      <value>f</value>
+      <value>short</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>s</value>
+      <key>samples_per_second</key>
+      <value>R</value>
     </param>
     <param>
-      <key>o_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>o_init_state</key>
+      <key>ignoretag</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>o_final_state</key>
-      <value>-1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>i_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
+      <key>_coordinate</key>
+      <value>(517, 103)</value>
     </param>
     <param>
-      <key>i_init_state</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
-      <key>i_final_state</key>
-      <value>-1</value>
+      <key>id</key>
+      <value>digital_chunks_to_symbols_xx_0</value>
     </param>
     <param>
-      <key>interleaver</key>
-      <value>trellis.interleaver(block,666)</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>block</value>
+      <key>in_type</key>
+      <value>short</value>
     </param>
     <param>
-      <key>iterations</key>
-      <value>10</value>
+      <key>out_type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>dim</key>
+      <key>symbol_table</key>
+      
<value>-7,0,-5,0,-3,0,-1,0,1,0,3,0,5,0,7,0,-7,0,-5,0,-3,0,-1,0,1,0,3,0,5,0,7</value>
+    </param>
+    <param>
+      <key>dimension</key>
       <value>2</value>
     </param>
     <param>
-      <key>table</key>
-      <value>-7,0, -5,0, -3,0, -1,0, 1,0, 3,0, 5,0, 7,0,   0,-7,0, -5,0, -3,0, 
-1,0, 1,0, 3,0, 5,0, 7</value>
+      <key>num_ports</key>
+      <value>1</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>siso_type</key>
-      <value>trellis.TRELLIS_MIN_SUM</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>scaling</key>
-      <value>1.0</value>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(196, 274)</value>
+      <value>(559, 180)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -597,10 +664,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_sub_xx</key>
+    <key>blocks_add_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_sub_xx_0</value>
+      <value>blocks_add_xx_1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -608,19 +675,35 @@
     </param>
     <param>
       <key>type</key>
-      <value>short</value>
+      <value>float</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>2</value>
     </param>
     <param>
       <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(217, 597)</value>
+      <value>(951, 256)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -628,10 +711,10 @@
     </param>
   </block>
   <block>
-    <key>analog_noise_source_x</key>
+    <key>trellis_pccc_encoder_xx</key>
     <param>
       <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <value>trellis_pccc_encoder_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -639,23 +722,51 @@
     </param>
     <param>
       <key>type</key>
-      <value>float</value>
+      <value>ss</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
+      <key>o_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>noisevar</value>
+      <key>o_init_state</key>
+      <value>0</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>-42</value>
+      <key>i_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
+    </param>
+    <param>
+      <key>i_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>interleaver_args</key>
+      <value>trellis.interleaver(block,666)</value>
+    </param>
+    <param>
+      <key>bl</key>
+      <value>block</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(584, 259)</value>
+      <value>(236, 147)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -663,10 +774,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>wxgui_numbersink2</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>wxgui_numbersink2_3_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -674,58 +785,83 @@
     </param>
     <param>
       <key>type</key>
-      <value>short</value>
+      <value>float</value>
     </param>
     <param>
-      <key>samples_per_second</key>
+      <key>title</key>
+      <value>BER</value>
+    </param>
+    <param>
+      <key>units</key>
+      <value>BER</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
       <value>R</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>min_value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(517, 103)</value>
+      <key>max_value</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>factor</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>decimal_places</key>
+      <value>6</value>
+    </param>
+    <param>
+      <key>ref_level</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>digital_chunks_to_symbols_xx</key>
     <param>
-      <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0</value>
+      <key>number_rate</key>
+      <value>15</value>
     </param>
     <param>
-      <key>_enabled</key>
+      <key>peak_hold</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
       <value>True</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
+      <key>avg_alpha</key>
+      <value>0.001</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>float</value>
+      <key>show_gauge</key>
+      <value>True</value>
     </param>
     <param>
-      <key>symbol_table</key>
-      
<value>-7,0,-5,0,-3,0,-1,0,1,0,3,0,5,0,7,0,-7,0,-5,0,-3,0,-1,0,1,0,3,0,5,0,7</value>
+      <key>win_size</key>
+      <value></value>
     </param>
     <param>
-      <key>dimension</key>
-      <value>2</value>
+      <key>grid_pos</key>
+      <value>1,0,1,1</value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>notebook</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(559, 180)</value>
+      <value>(719, 462)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -733,10 +869,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_add_xx</key>
+    <key>trellis_pccc_decoder_combined_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_add_xx_1</value>
+      <value>trellis_pccc_decoder_combined_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -744,23 +880,91 @@
     </param>
     <param>
       <key>type</key>
-      <value>float</value>
+      <value>f</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>out_type</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>o_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
+    </param>
+    <param>
+      <key>o_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>o_final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>i_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
+    </param>
+    <param>
+      <key>i_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>i_final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>interleaver</key>
+      <value>trellis.interleaver(block,666)</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block</value>
+    </param>
+    <param>
+      <key>iterations</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>dim</key>
       <value>2</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>table</key>
+      <value>-7,0, -5,0, -3,0, -1,0, 1,0, 3,0, 5,0, 7,0,   0,-7,0, -5,0, -3,0, 
-1,0, 1,0, 3,0, 5,0, 7</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>siso_type</key>
+      <value>trellis.TRELLIS_MIN_SUM</value>
+    </param>
+    <param>
+      <key>scaling</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(951, 256)</value>
+      <value>(309, 307)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>0</value>
+      <value>180</value>
     </param>
   </block>
   <connection>
diff --git a/gr-trellis/examples/grc/sccc.grc b/gr-trellis/examples/grc/sccc.grc
index 3c10d0c..962f37a 100644
--- a/gr-trellis/examples/grc/sccc.grc
+++ b/gr-trellis/examples/grc/sccc.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:34:26 2012</timestamp>
+  <timestamp>Sat Jul 12 17:38:15 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -52,6 +52,10 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(10, 10)</value>
     </param>
@@ -64,7 +68,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>noisevar</value>
+      <value>prefix</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +76,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>10**(-snr_db/10)</value>
+      <value>"/home/mbant/src/gnuradio/"</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(389, 15)</value>
+      <value>(572, 9)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,38 +92,53 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x_0</value>
+      <value>R</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>short</value>
+      <key>value</key>
+      <value>10e3</value>
     </param>
     <param>
-      <key>min</key>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(482, 17)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>block</value>
+    </param>
     <param>
-      <key>max</key>
-      <value>2</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>num_samps</key>
+      <key>value</key>
       <value>1000</value>
     </param>
     <param>
-      <key>repeat</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(21, 170)</value>
+      <value>(764, 16)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -126,7 +149,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>prefix</value>
+      <value>noisevar</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -134,11 +157,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>"/n/harrisville/x/anastas/gnuradio_trunk/"</value>
+      <value>10**(-snr_db/10)</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(590, 15)</value>
+      <value>(389, 15)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -146,22 +173,54 @@
     </param>
   </block>
   <block>
-    <key>variable</key>
+    <key>analog_random_source_x</key>
     <param>
       <key>id</key>
-      <value>block</value>
+      <value>analog_random_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
+      <key>type</key>
+      <value>short</value>
+    </param>
+    <param>
+      <key>min</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>max</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>num_samps</key>
       <value>1000</value>
     </param>
     <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(764, 16)</value>
+      <value>(21, 170)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -191,6 +250,22 @@
       <value>2</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(445, 517)</value>
     </param>
@@ -222,6 +297,22 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(228.25, 798.39170361874085)</value>
     </param>
@@ -249,6 +340,22 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(416, 815)</value>
     </param>
@@ -304,31 +411,12 @@
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(229, 13)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable</key>
-    <param>
-      <key>id</key>
-      <value>R</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>10e3</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(482, 17)</value>
+      <value>(229, 13)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -402,55 +490,16 @@
       <value>Counts</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(952, 73)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>trellis_sccc_encoder_xx</key>
-    <param>
-      <key>id</key>
-      <value>trellis_sccc_encoder_xx_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>ss</value>
-    </param>
-    <param>
-      <key>o_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
-    </param>
-    <param>
-      <key>o_init_state</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>i_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn2o3_4.fsm"</value>
-    </param>
-    <param>
-      <key>i_init_state</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>interleaver_args</key>
-      <value>trellis.interleaver(block,666)</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>bl</key>
-      <value>block</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(242, 154)</value>
+      <value>(952, 73)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -536,6 +585,14 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(688, 572)</value>
     </param>
@@ -545,10 +602,10 @@
     </param>
   </block>
   <block>
-    <key>trellis_sccc_decoder_combined_xx</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>trellis_sccc_decoder_combined_xx_0</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -556,71 +613,86 @@
     </param>
     <param>
       <key>type</key>
-      <value>c</value>
+      <value>short</value>
     </param>
     <param>
-      <key>out_type</key>
-      <value>s</value>
+      <key>samples_per_second</key>
+      <value>R</value>
     </param>
     <param>
-      <key>o_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn1o2_4.fsm"</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>o_init_state</key>
-      <value>0</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>o_final_state</key>
-      <value>-1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>i_fsm_args</key>
-      <value>prefix+"gr-trellis/src/examples/fsm_files/awgn2o3_4.fsm"</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>i_init_state</key>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>i_final_state</key>
-      <value>-1</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>interleaver</key>
-      <value>trellis.interleaver(block,666)</value>
+      <key>_coordinate</key>
+      <value>(514, 105)</value>
     </param>
     <param>
-      <key>block_size</key>
-      <value>block</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
     <param>
-      <key>iterations</key>
-      <value>5</value>
+      <key>id</key>
+      <value>blocks_add_xx_1</value>
     </param>
     <param>
-      <key>dim</key>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
       <value>2</value>
     </param>
     <param>
-      <key>table</key>
-      <value>1,0,1j,0,-1j,0,-1,0,   0,1,0,1j,0,-1j,0,-1</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>metric_type</key>
-      <value>digital.TRELLIS_EUCLIDEAN</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>siso_type</key>
-      <value>trellis.TRELLIS_SUM_PRODUCT</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>scaling</key>
-      <value>1.0</value>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(159, 335)</value>
+      <value>(951, 256)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -628,30 +700,54 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>digital_chunks_to_symbols_xx</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>digital_chunks_to_symbols_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
+      <key>in_type</key>
       <value>short</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>R</value>
+      <key>out_type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>symbol_table</key>
+      <value>1,0,1j,0,-1j,0,-1,0,0,1,0,1j,0,-1j,0,01</value>
+    </param>
+    <param>
+      <key>dimension</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>num_ports</key>
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(514, 105)</value>
+      <value>(551, 181)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -659,10 +755,10 @@
     </param>
   </block>
   <block>
-    <key>blocks_add_xx</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>blocks_add_xx_1</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -673,16 +769,36 @@
       <value>complex</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>2</value>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>amp</key>
+      <value>noisevar</value>
+    </param>
+    <param>
+      <key>seed</key>
+      <value>-42</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(951, 256)</value>
+      <value>(651, 270)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -690,49 +806,109 @@
     </param>
   </block>
   <block>
-    <key>digital_chunks_to_symbols_xx</key>
+    <key>trellis_sccc_decoder_combined_xx</key>
     <param>
       <key>id</key>
-      <value>digital_chunks_to_symbols_xx_0</value>
+      <value>trellis_sccc_decoder_combined_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>in_type</key>
-      <value>short</value>
+      <key>type</key>
+      <value>c</value>
     </param>
     <param>
       <key>out_type</key>
-      <value>complex</value>
+      <value>s</value>
     </param>
     <param>
-      <key>symbol_table</key>
-      <value>1,0,1j,0,-1j,0,-1,0,0,1,0,1j,0,-1j,0,01</value>
+      <key>o_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
     </param>
     <param>
-      <key>dimension</key>
+      <key>o_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>o_final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>i_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
+    </param>
+    <param>
+      <key>i_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>i_final_state</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>interleaver</key>
+      <value>trellis.interleaver(block,666)</value>
+    </param>
+    <param>
+      <key>block_size</key>
+      <value>block</value>
+    </param>
+    <param>
+      <key>iterations</key>
+      <value>5</value>
+    </param>
+    <param>
+      <key>dim</key>
       <value>2</value>
     </param>
     <param>
-      <key>num_ports</key>
-      <value>1</value>
+      <key>table</key>
+      <value>1,0,1j,0,-1j,0,-1,0,   0,1,0,1j,0,-1j,0,-1</value>
+    </param>
+    <param>
+      <key>metric_type</key>
+      <value>digital.TRELLIS_EUCLIDEAN</value>
+    </param>
+    <param>
+      <key>siso_type</key>
+      <value>trellis.TRELLIS_SUM_PRODUCT</value>
+    </param>
+    <param>
+      <key>scaling</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(551, 181)</value>
+      <value>(388, 263)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>0</value>
+      <value>180</value>
     </param>
   </block>
   <block>
-    <key>analog_noise_source_x</key>
+    <key>trellis_sccc_encoder_xx</key>
     <param>
       <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <value>trellis_sccc_encoder_xx_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -740,23 +916,51 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>ss</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
+      <key>o_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>noisevar</value>
+      <key>o_init_state</key>
+      <value>0</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>-42</value>
+      <key>i_fsm_args</key>
+      
<value>prefix+"gr-trellis/examples/python/fsm_files/awgn1o2_4.fsm"</value>
+    </param>
+    <param>
+      <key>i_init_state</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>interleaver_args</key>
+      <value>trellis.interleaver(block,666)</value>
+    </param>
+    <param>
+      <key>bl</key>
+      <value>block</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(651, 270)</value>
+      <value>(207, 175)</value>
     </param>
     <param>
       <key>_rotation</key>
diff --git a/gr-uhd/examples/grc/uhd_const_wave.grc 
b/gr-uhd/examples/grc/uhd_const_wave.grc
index 4659610..dfbbea6 100644
--- a/gr-uhd/examples/grc/uhd_const_wave.grc
+++ b/gr-uhd/examples/grc/uhd_const_wave.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Mar 18 11:04:05 2013</timestamp>
+  <timestamp>Sat Jul 12 14:52:24 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,208 +52,12 @@
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(10, 10)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>ampl</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Amplitude</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>.1</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(174, 313)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>tun_gain</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>UHD Gain</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>gain</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>20</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(318, 314)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>tun_freq</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>UHD Freq (Hz)</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>2.4e9</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>2.5e9</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(24, 315)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>parameter</key>
-    <param>
-      <key>id</key>
-      <value>address</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>IP Address</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>addr=192.168.11.2</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>string</value>
-    </param>
-    <param>
-      <key>short_id</key>
-      <value>a</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(188, 12)</value>
+      <value>(10, 9)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -287,6 +91,10 @@
       <value>s</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(342, 14)</value>
     </param>
@@ -322,6 +130,10 @@
       <value>f</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(468, 14)</value>
     </param>
@@ -357,6 +169,10 @@
       <value>g</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(616, 13)</value>
     </param>
@@ -388,10 +204,18 @@
       <value></value>
     </param>
     <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
       <key>dev_addr</key>
       <value>address</value>
     </param>
     <param>
+      <key>dev_args</key>
+      <value>""</value>
+    </param>
+    <param>
       <key>sync</key>
       <value></value>
     </param>
@@ -1020,6 +844,18 @@
       <value>0</value>
     </param>
     <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(308, 169)</value>
     </param>
@@ -1047,6 +883,22 @@
       <value>ampl</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
       <value>(74, 193)</value>
     </param>
@@ -1055,6 +907,222 @@
       <value>0</value>
     </param>
   </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>ampl</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Amplitude</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(170, 314)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Freq (Hz)</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>2.45e9</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>2.4e9</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>2.5e9</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(31, 317)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>20</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(302, 307)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>address</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>IP Address</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>addr=192.168.10.2</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>a</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(188, 12)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
   <connection>
     <source_block_id>analog_const_source_x_0</source_block_id>
     <sink_block_id>uhd_usrp_sink_0</sink_block_id>
diff --git a/gr-uhd/examples/grc/uhd_dpsk_mod.grc 
b/gr-uhd/examples/grc/uhd_dpsk_mod.grc
index 1e5bfd5..be6ec55 100644
--- a/gr-uhd/examples/grc/uhd_dpsk_mod.grc
+++ b/gr-uhd/examples/grc/uhd_dpsk_mod.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Oct  8 14:44:48 2011</timestamp>
+  <timestamp>Sat Jul 12 15:58:18 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -44,12 +44,20 @@
       <value>True</value>
     </param>
     <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>realtime_scheduling</key>
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(-5, -2)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -71,8 +79,12 @@
       <value>8</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(33, 280)</value>
+      <value>(743, 124)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -80,86 +92,92 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>rolloff</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>value</key>
+      <value>.35</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>_coordinate</key>
+      <value>(566, 548)</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>tun_freq</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>id</key>
+      <value>nfilts</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>value</key>
+      <value>32</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>_coordinate</key>
+      <value>(653, 548)</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>parameter</key>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>id</key>
+      <value>tx_gain</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>label</key>
+      <value>Default TX Gain</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>type</key>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>short_id</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(697, 248)</value>
+      <value>(968, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -167,74 +185,77 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
-      <value>False</value>
+      <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value>Default Frequency</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>value</key>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>type</key>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>short_id</key>
+      <value>f</value>
     </param>
     <param>
-      <key>v_offset</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>1e-6</value>
+      <key>_coordinate</key>
+      <value>(634, 0)</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>parameter</key>
     <param>
-      <key>xy_mode</key>
-      <value>True</value>
+      <key>id</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>label</key>
+      <value>Sample Rate</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>value</key>
+      <value>1e6</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>type</key>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>short_id</key>
+      <value>s</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(469, 355)</value>
+      <value>(508, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -242,38 +263,38 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x_0</value>
+      <value>address0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>label</key>
+      <value>IP Address, Dev 0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>value</key>
+      <value>addr=192.168.10.2</value>
     </param>
     <param>
-      <key>max</key>
-      <value>256</value>
+      <key>type</key>
+      <value>string</value>
     </param>
     <param>
-      <key>num_samps</key>
-      <value>1000</value>
+      <key>short_id</key>
+      <value></value>
     </param>
     <param>
-      <key>repeat</key>
-      <value>True</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(245, 139)</value>
+      <value>(162, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -281,30 +302,38 @@
     </param>
   </block>
   <block>
-    <key>blocks_multiply_const_vxx</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_const_vxx_0</value>
+      <value>freq_offset</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>label</key>
+      <value>Rx Frequency Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>type</key>
-      <value>complex</value>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>const</key>
-      <value>ampl</value>
+      <key>short_id</key>
+      <value>o</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(647, 163)</value>
+      <value>(789, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -312,10 +341,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>tun_rx_gain</value>
+      <value>rx_gain</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -323,43 +352,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>UHD RX Gain</value>
+      <value>Default RX Gain</value>
     </param>
     <param>
       <key>value</key>
-      <value>rx_gain</value>
-    </param>
-    <param>
-      <key>min</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>20</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>type</key>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>short_id</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(477, 509)</value>
+      <value>(1102, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -367,54 +380,73 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>import</key>
     <param>
       <key>id</key>
-      <value>rx_freq_off</value>
+      <value>import_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>RX Freq Offset (Hz)</value>
+      <key>import</key>
+      <value>from gnuradio import digital</value>
     </param>
     <param>
-      <key>value</key>
-      <value>freq_offset</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>min</key>
-      <value>-50e3</value>
+      <key>_coordinate</key>
+      <value>(169, 93)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx_0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>+50e3</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>const</key>
+      <value>ampl</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(190, 507)</value>
+      <value>(396, 161)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -422,10 +454,10 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>rx_gain</value>
+      <value>ampl</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -433,23 +465,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default RX Gain</value>
+      <value>Amplitude</value>
     </param>
     <param>
       <key>value</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>short_id</key>
+      <key>step</key>
+      <value>0.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(1137, 8)</value>
+      <value>(916, 115)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -460,7 +516,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>address1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -468,23 +524,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>Rx Frequency Offset</value>
+      <value>IP Address, Dev 1</value>
     </param>
     <param>
       <key>value</key>
-      <value>0</value>
+      <value>addr=192.168.10.2</value>
     </param>
     <param>
       <key>type</key>
-      <value>eng_float</value>
+      <value>string</value>
     </param>
     <param>
       <key>short_id</key>
-      <value>o</value>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(824, 8)</value>
+      <value>(322, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -492,10 +552,10 @@
     </param>
   </block>
   <block>
-    <key>uhd_usrp_source</key>
+    <key>uhd_usrp_sink</key>
     <param>
       <key>id</key>
-      <value>uhd_usrp_source_0</value>
+      <value>uhd_usrp_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -503,11 +563,27 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>fc32</value>
+    </param>
+    <param>
+      <key>otw</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_args</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_chans</key>
+      <value>[]</value>
     </param>
     <param>
       <key>dev_addr</key>
-      <value>address1</value>
+      <value>address0</value>
+    </param>
+    <param>
+      <key>dev_args</key>
+      <value>""</value>
     </param>
     <param>
       <key>sync</key>
@@ -522,15 +598,23 @@
       <value>1</value>
     </param>
     <param>
-      <key>ref_source0</key>
+      <key>clock_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source0</key>
       <value></value>
     </param>
     <param>
       <key>sd_spec0</key>
+      <value>B:0</value>
+    </param>
+    <param>
+      <key>clock_source1</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source1</key>
+      <key>time_source1</key>
       <value></value>
     </param>
     <param>
@@ -538,56 +622,80 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source2</key>
+      <key>clock_source2</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec2</key>
+      <key>time_source2</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source3</key>
+      <key>sd_spec2</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec3</key>
+      <key>clock_source3</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source4</key>
+      <key>time_source3</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec4</key>
+      <key>sd_spec3</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source5</key>
+      <key>clock_source4</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec5</key>
+      <key>time_source4</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source6</key>
+      <key>sd_spec4</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec6</key>
+      <key>clock_source5</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source7</key>
+      <key>time_source5</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec7</key>
+      <key>sd_spec5</key>
       <value></value>
     </param>
     <param>
-      <key>nchan</key>
-      <value>1</value>
+      <key>clock_source6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_source7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>nchan</key>
+      <value>1</value>
     </param>
     <param>
       <key>samp_rate</key>
@@ -595,7 +703,7 @@
     </param>
     <param>
       <key>center_freq0</key>
-      <value>tun_freq+rx_freq_off</value>
+      <value>tun_freq</value>
     </param>
     <param>
       <key>gain0</key>
@@ -1106,8 +1214,20 @@
       <value>0</value>
     </param>
     <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(216, 288)</value>
+      <value>(576, 131)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1115,187 +1235,341 @@
     </param>
   </block>
   <block>
-    <key>wxgui_constellationsink2</key>
+    <key>qtgui_const_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_constellationsink2_0</value>
+      <value>qtgui_const_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
-      <value>True</value>
+      <value>False</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Constellation Plot</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>name</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>xmin</key>
+      <value>-2</value>
+    </param>
+    <param>
+      <key>xmax</key>
+      <value>2</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>frame_rate</key>
-      <value>5</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>const_size</key>
-      <value>2048</value>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>M</key>
-      <value>4</value>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>theta</key>
+      <key>tr_chan</key>
       <value>0</value>
     </param>
     <param>
-      <key>loop_bw</key>
-      <value>6.28/100.0</value>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>fmax</key>
-      <value>0.06</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>mu</key>
-      <value>0.5</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>gain_mu</key>
-      <value>0.005</value>
+      <key>style1</key>
+      <value>0</value>
     </param>
     <param>
-      <key>symbol_rate</key>
-      <value>samp_rate/samps_per_sym</value>
+      <key>marker1</key>
+      <value>0</value>
     </param>
     <param>
-      <key>omega_limit</key>
-      <value>0.005</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(862, 336)</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>color4</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style4</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>digital_dxpsk_mod</key>
     <param>
-      <key>id</key>
-      <value>digital_dxpsk_mod_0</value>
+      <key>marker4</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>dqpsk</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>samples_per_symbol</key>
-      <value>samps_per_sym</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>excess_bw</key>
-      <value>0.35</value>
+      <key>color5</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>gray_coded</key>
-      <value>True</value>
+      <key>style5</key>
+      <value>0</value>
     </param>
     <param>
-      <key>verbose</key>
-      <value>False</value>
+      <key>marker5</key>
+      <value>0</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(426, 139)</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style6</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>ampl</value>
+      <key>marker6</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Amplitude</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>.1</value>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>0</value>
     </param>
     <param>
-      <key>min</key>
+      <key>marker9</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>color10</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>0</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker10</key>
+      <value>0</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(33, 353)</value>
+      <value>(1, 367)</value>
     </param>
     <param>
       <key>_rotation</key>
-      <value>0</value>
+      <value>180</value>
     </param>
   </block>
   <block>
-    <key>uhd_usrp_sink</key>
+    <key>uhd_usrp_source</key>
     <param>
       <key>id</key>
-      <value>uhd_usrp_sink_0</value>
+      <value>uhd_usrp_source_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1303,11 +1577,27 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>fc32</value>
+    </param>
+    <param>
+      <key>otw</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_args</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_chans</key>
+      <value>[]</value>
     </param>
     <param>
       <key>dev_addr</key>
-      <value>address0</value>
+      <value>address1</value>
+    </param>
+    <param>
+      <key>dev_args</key>
+      <value>""</value>
     </param>
     <param>
       <key>sync</key>
@@ -1322,15 +1612,23 @@
       <value>1</value>
     </param>
     <param>
-      <key>ref_source0</key>
+      <key>clock_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source0</key>
       <value></value>
     </param>
     <param>
       <key>sd_spec0</key>
+      <value>A:0</value>
+    </param>
+    <param>
+      <key>clock_source1</key>
       <value></value>
     </param>
     <param>
-      <key>ref_source1</key>
+      <key>time_source1</key>
       <value></value>
     </param>
     <param>
@@ -1338,7 +1636,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source2</key>
+      <key>clock_source2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source2</key>
       <value></value>
     </param>
     <param>
@@ -1346,7 +1648,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source3</key>
+      <key>clock_source3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source3</key>
       <value></value>
     </param>
     <param>
@@ -1354,7 +1660,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source4</key>
+      <key>clock_source4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source4</key>
       <value></value>
     </param>
     <param>
@@ -1362,7 +1672,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source5</key>
+      <key>clock_source5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source5</key>
       <value></value>
     </param>
     <param>
@@ -1370,7 +1684,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source6</key>
+      <key>clock_source6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source6</key>
       <value></value>
     </param>
     <param>
@@ -1378,7 +1696,11 @@
       <value></value>
     </param>
     <param>
-      <key>ref_source7</key>
+      <key>clock_source7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source7</key>
       <value></value>
     </param>
     <param>
@@ -1395,7 +1717,7 @@
     </param>
     <param>
       <key>center_freq0</key>
-      <value>tun_freq</value>
+      <value>tun_freq+rx_freq_off</value>
     </param>
     <param>
       <key>gain0</key>
@@ -1906,8 +2228,24 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(838, 139)</value>
+      <value>(-1, 242)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1915,124 +2253,1180 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>digital_dxpsk_mod</key>
     <param>
       <key>id</key>
-      <value>tun_tx_gain</value>
+      <value>digital_dxpsk_mod_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>UHD TX Gain</value>
+      <key>type</key>
+      <value>dqpsk</value>
     </param>
     <param>
-      <key>value</key>
-      <value>tx_gain</value>
+      <key>samples_per_symbol</key>
+      <value>samps_per_sym</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
+      <key>excess_bw</key>
+      <value>0.35</value>
+    </param>
+    <param>
+      <key>mod_code</key>
+      <value>"gray"</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(204, 138)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_vector_source_x</key>
+    <param>
+      <key>id</key>
+      <value>blocks_vector_source_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vector</key>
+      <value>range(256)</value>
+    </param>
+    <param>
+      <key>tags</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>repeat</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(6, 142)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Rx Time Signal</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(294, 265)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Freq (Hz)</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1.982e9</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>1.9e9</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>2.5e9</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(5, 545)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_rx_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Rx Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>30</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(391, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_tx_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Tx Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>30</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(277, 546)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>rx_freq_off</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Rx Freq Offset (Hz)</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>-50e3</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>50e3</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(130, 547)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_dxpsk_demod</key>
+    <param>
+      <key>id</key>
+      <value>digital_dxpsk_demod_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>dqpsk</value>
+    </param>
+    <param>
+      <key>samples_per_symbol</key>
+      <value>samps_per_sym</value>
+    </param>
+    <param>
+      <key>excess_bw</key>
+      <value>0.35</value>
+    </param>
+    <param>
+      <key>freq_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>phase_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>timing_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>mod_code</key>
+      <value>"gray"</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>sync_out</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(294, 375)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_unpacked_to_packed_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_unpacked_to_packed_xx_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>bits_per_chunk</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>endianness</key>
+      <value>gr.GR_LSB_FIRST</value>
+    </param>
+    <param>
+      <key>num_ports</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(542, 420)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_uchar_to_float</key>
+    <param>
+      <key>id</key>
+      <value>blocks_uchar_to_float_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(747, 431)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_1</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Received Data</value>
+    </param>
+    <param>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>entags</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
+    </param>
+    <param>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
+    </param>
+    <param>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_chan</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>style2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker2</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
     <param>
-      <key>max</key>
-      <value>20</value>
+      <key>style3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker3</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>style5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker5</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(351, 508)</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>address0</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>IP Address, Dev 0</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>addr=192.168.10.2</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>short_id</key>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(197, 11)</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>address1</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>IP Address, Dev 1</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>addr=192.168.11.2</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>short_id</key>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(357, 11)</value>
+      <value>(923, 405)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2040,159 +3434,238 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Sample Rate</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1e6</value>
+      <key>name</key>
+      <value>Received Spectrum</value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>fftsize</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>s</value>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(543, 8)</value>
+      <key>fc</key>
+      <value>tun_freq+rx_freq_off</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>bw</key>
+      <value>samp_rate</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>freq</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>average</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default Frequency</value>
+      <key>ymin</key>
+      <value>-140</value>
     </param>
     <param>
-      <key>value</key>
-      <value>2.45e9</value>
+      <key>ymax</key>
+      <value>10</value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>f</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(669, 8)</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label1</key>
+      <value>Received Spectrum</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>tx_gain</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default TX Gain</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>short_id</key>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1003, 8)</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>tun_freq</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>label</key>
-      <value>Freq (Hz)</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>freq</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>min</key>
-      <value>2.4e9</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>2.5e9</value>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(35, 506)</value>
+      <value>(610, 254)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2201,19 +3674,19 @@
   </block>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <sink_block_id>qtgui_const_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_constellationsink2_0</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <source_block_id>digital_dxpsk_mod_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -2224,14 +3697,38 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_random_source_x_0</source_block_id>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>digital_dxpsk_demod_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_vector_source_x_0</source_block_id>
     <sink_block_id>digital_dxpsk_mod_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_dxpsk_mod_0</source_block_id>
-    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_block_id>digital_dxpsk_demod_0</source_block_id>
+    <sink_block_id>blocks_unpacked_to_packed_xx_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_unpacked_to_packed_xx_0</source_block_id>
+    <sink_block_id>blocks_uchar_to_float_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>blocks_uchar_to_float_0</source_block_id>
+    <sink_block_id>qtgui_time_sink_x_1</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-uhd/examples/grc/uhd_fft.grc b/gr-uhd/examples/grc/uhd_fft.grc
index 08e5f70..13271ca 100644
--- a/gr-uhd/examples/grc/uhd_fft.grc
+++ b/gr-uhd/examples/grc/uhd_fft.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Mar 18 15:42:27 2013</timestamp>
+  <timestamp>Sat Jul 12 16:12:28 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(15, 15)</value>
+      <value>(-1, -3)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -61,22 +65,38 @@
     </param>
   </block>
   <block>
-    <key>import</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>import_0</value>
+      <value>param_gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>import</key>
-      <value>import numpy</value>
+      <key>label</key>
+      <value>Default Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>g</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(15, 121)</value>
+      <value>(642, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -110,8 +130,12 @@
       <value>s</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(358, 14)</value>
+      <value>(328, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -145,8 +169,12 @@
       <value>f</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(508, 14)</value>
+      <value>(478, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -154,34 +182,26 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>import</key>
     <param>
       <key>id</key>
-      <value>param_gain</value>
+      <value>import_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default Gain</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>import</key>
+      <value>import numpy</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>g</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(672, 13)</value>
+      <value>(4, 105)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -189,74 +209,89 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2_0</value>
+      <value>address</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>label</key>
+      <value>IP Address</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>addr=192.168.10.2</value>
+    </param>
+    <param>
       <key>type</key>
-      <value>complex</value>
+      <value>string</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>short_id</key>
+      <value>a</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>v_scale</key>
-      <value>0</value>
+      <key>_coordinate</key>
+      <value>(160, 0)</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>qtgui_tab_widget</key>
     <param>
-      <key>t_scale</key>
-      <value>0</value>
+      <key>id</key>
+      <value>display</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>num_tabs</key>
+      <value>3</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>label0</key>
+      <value>Spectrum</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>label1</key>
+      <value>Waterfall</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>label2</key>
+      <value>Scope</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>nb0, 2</value>
+      <key>label3</key>
+      <value>Tab 3</value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>label4</key>
+      <value>Tab 4</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>gui_hint</key>
+      <value>2,0,1,4</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(314, 250)</value>
+      <value>(6, 178)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -264,881 +299,1446 @@
     </param>
   </block>
   <block>
-    <key>uhd_usrp_source</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>uhd_usrp_source_0</value>
+      <value>gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>fc32</value>
+      <key>label</key>
+      <value>RX Gain</value>
     </param>
     <param>
-      <key>otw</key>
-      <value></value>
+      <key>value</key>
+      <value>15</value>
     </param>
     <param>
-      <key>stream_args</key>
-      <value></value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>dev_addr</key>
-      <value>address</value>
+      <key>stop</key>
+      <value>31.5</value>
     </param>
     <param>
-      <key>sync</key>
-      <value></value>
+      <key>step</key>
+      <value>.5</value>
     </param>
     <param>
-      <key>clock_rate</key>
-      <value>0.0</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>num_mboards</key>
-      <value>1</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>clock_source0</key>
-      <value></value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>time_source0</key>
-      <value></value>
+      <key>gui_hint</key>
+      <value>1,2,1,2</value>
     </param>
     <param>
-      <key>sd_spec0</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>clock_source1</key>
-      <value></value>
+      <key>_coordinate</key>
+      <value>(694, 216)</value>
     </param>
     <param>
-      <key>time_source1</key>
-      <value></value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
     <param>
-      <key>sd_spec1</key>
-      <value></value>
+      <key>id</key>
+      <value>freq</value>
     </param>
     <param>
-      <key>clock_source2</key>
-      <value></value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>time_source2</key>
-      <value></value>
+      <key>label</key>
+      <value>RX Tune Frequency</value>
     </param>
     <param>
-      <key>sd_spec2</key>
-      <value></value>
+      <key>value</key>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>clock_source3</key>
-      <value></value>
+      <key>start</key>
+      <value>50e6</value>
     </param>
     <param>
-      <key>time_source3</key>
-      <value></value>
+      <key>stop</key>
+      <value>6e9</value>
     </param>
     <param>
-      <key>sd_spec3</key>
-      <value></value>
+      <key>step</key>
+      <value>100e3</value>
     </param>
     <param>
-      <key>clock_source4</key>
-      <value></value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>time_source4</key>
-      <value></value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>sd_spec4</key>
-      <value></value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>clock_source5</key>
-      <value></value>
+      <key>gui_hint</key>
+      <value>1,0,1,2</value>
     </param>
     <param>
-      <key>time_source5</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>sd_spec5</key>
-      <value></value>
+      <key>_coordinate</key>
+      <value>(538, 214)</value>
     </param>
     <param>
-      <key>clock_source6</key>
-      <value></value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_chooser</key>
     <param>
-      <key>time_source6</key>
-      <value></value>
+      <key>id</key>
+      <value>ant</value>
     </param>
     <param>
-      <key>sd_spec6</key>
-      <value></value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>clock_source7</key>
-      <value></value>
+      <key>label</key>
+      <value>Antenna</value>
     </param>
     <param>
-      <key>time_source7</key>
-      <value></value>
+      <key>type</key>
+      <value>string</value>
     </param>
     <param>
-      <key>sd_spec7</key>
-      <value></value>
+      <key>num_opts</key>
+      <value>4</value>
     </param>
     <param>
-      <key>nchan</key>
-      <value>1</value>
+      <key>value</key>
+      <value>RX2</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>options</key>
+      <value>[0, 1, 2]</value>
     </param>
     <param>
-      <key>center_freq0</key>
-      <value>freq</value>
+      <key>labels</key>
+      <value>[]</value>
     </param>
     <param>
-      <key>gain0</key>
-      <value>gain</value>
+      <key>option0</key>
+      <value>RX2</value>
     </param>
     <param>
-      <key>ant0</key>
-      <value>ant</value>
+      <key>label0</key>
+      <value>RX2</value>
     </param>
     <param>
-      <key>bw0</key>
-      <value>samp_rate</value>
+      <key>option1</key>
+      <value>TX/RX</value>
     </param>
     <param>
-      <key>center_freq1</key>
-      <value>0</value>
+      <key>label1</key>
+      <value>TX/RX</value>
     </param>
     <param>
-      <key>gain1</key>
-      <value>0</value>
+      <key>option2</key>
+      <value>J1</value>
     </param>
     <param>
-      <key>ant1</key>
-      <value></value>
+      <key>label2</key>
+      <value>J1</value>
     </param>
     <param>
-      <key>bw1</key>
-      <value>0</value>
+      <key>option3</key>
+      <value>J2</value>
     </param>
     <param>
-      <key>center_freq2</key>
-      <value>0</value>
+      <key>label3</key>
+      <value>J2</value>
     </param>
     <param>
-      <key>gain2</key>
-      <value>0</value>
+      <key>option4</key>
+      <value>4</value>
     </param>
     <param>
-      <key>ant2</key>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>bw2</key>
-      <value>0</value>
+      <key>widget</key>
+      <value>combo_box</value>
     </param>
     <param>
-      <key>center_freq3</key>
-      <value>0</value>
+      <key>orient</key>
+      <value>Qt.QVBoxLayout</value>
     </param>
     <param>
-      <key>gain3</key>
-      <value>0</value>
+      <key>gui_hint</key>
+      <value>0,2,1,2</value>
     </param>
     <param>
-      <key>ant3</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>bw3</key>
-      <value>0</value>
+      <key>_coordinate</key>
+      <value>(810, 124)</value>
     </param>
     <param>
-      <key>center_freq4</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_label</key>
     <param>
-      <key>gain4</key>
-      <value>0</value>
+      <key>id</key>
+      <value>lo_locked_probe</value>
     </param>
     <param>
-      <key>ant4</key>
-      <value></value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>bw4</key>
-      <value>0</value>
+      <key>label</key>
+      <value>LO locked</value>
     </param>
     <param>
-      <key>center_freq5</key>
-      <value>0</value>
+      <key>type</key>
+      <value>bool</value>
     </param>
     <param>
-      <key>gain5</key>
-      <value>0</value>
+      <key>value</key>
+      <value>chan0_lo_locked.to_bool()</value>
     </param>
     <param>
-      <key>ant5</key>
-      <value></value>
+      <key>gui_hint</key>
+      <value>0,1,1,1</value>
     </param>
     <param>
-      <key>bw5</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>center_freq6</key>
-      <value>0</value>
+      <key>_coordinate</key>
+      <value>(662, 127)</value>
     </param>
     <param>
-      <key>gain6</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_label</key>
     <param>
-      <key>ant6</key>
-      <value></value>
+      <key>id</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>bw6</key>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Sample Rate</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>real</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1e6</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,0,1,1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(543, 128)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_function_probe</key>
     <param>
-      <key>center_freq7</key>
+      <key>id</key>
+      <value>chan0_lo_locked</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>uhd.sensor_value("", False, "")</value>
+    </param>
+    <param>
+      <key>block_id</key>
+      <value>uhd_usrp_source_0</value>
+    </param>
+    <param>
+      <key>function_name</key>
+      <value>get_sensor</value>
+    </param>
+    <param>
+      <key>function_args</key>
+      <value>"'lo_locked'"</value>
+    </param>
+    <param>
+      <key>poll_rate</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1014, 164)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>qtgui_waterfall_sink_x</key>
     <param>
-      <key>gain7</key>
+      <key>id</key>
+      <value>qtgui_waterfall_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Scope</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:3,0,1,4</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color1</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant7</key>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>bw7</key>
+      <key>color2</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(325, 328)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>Spectrum</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>address@hidden:3,0,1,4</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(311, 217)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>uhd_usrp_source</key>
+    <param>
+      <key>id</key>
+      <value>uhd_usrp_source_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>fc32</value>
+    </param>
+    <param>
+      <key>otw</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_args</key>
+      <value></value>
+    </param>
+    <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
+      <key>dev_addr</key>
+      <value>address</value>
+    </param>
+    <param>
+      <key>dev_args</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>sync</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_rate</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>num_mboards</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>clock_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec0</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_source1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_source2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_source3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>sd_spec3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>clock_source4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>time_source4</key>
+      <value></value>
+    </param>
     <param>
-      <key>center_freq8</key>
-      <value>0</value>
+      <key>sd_spec4</key>
+      <value></value>
     </param>
     <param>
-      <key>gain8</key>
-      <value>0</value>
+      <key>clock_source5</key>
+      <value></value>
     </param>
     <param>
-      <key>ant8</key>
+      <key>time_source5</key>
       <value></value>
     </param>
     <param>
-      <key>bw8</key>
-      <value>0</value>
+      <key>sd_spec5</key>
+      <value></value>
     </param>
     <param>
-      <key>center_freq9</key>
-      <value>0</value>
+      <key>clock_source6</key>
+      <value></value>
     </param>
     <param>
-      <key>gain9</key>
-      <value>0</value>
+      <key>time_source6</key>
+      <value></value>
     </param>
     <param>
-      <key>ant9</key>
+      <key>sd_spec6</key>
       <value></value>
     </param>
     <param>
-      <key>bw9</key>
-      <value>0</value>
+      <key>clock_source7</key>
+      <value></value>
     </param>
     <param>
-      <key>center_freq10</key>
-      <value>0</value>
+      <key>time_source7</key>
+      <value></value>
     </param>
     <param>
-      <key>gain10</key>
-      <value>0</value>
+      <key>sd_spec7</key>
+      <value></value>
     </param>
     <param>
-      <key>ant10</key>
-      <value></value>
+      <key>nchan</key>
+      <value>1</value>
     </param>
     <param>
-      <key>bw10</key>
-      <value>0</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>center_freq11</key>
-      <value>0</value>
+      <key>center_freq0</key>
+      <value>freq</value>
     </param>
     <param>
-      <key>gain11</key>
-      <value>0</value>
+      <key>gain0</key>
+      <value>gain</value>
     </param>
     <param>
-      <key>ant11</key>
-      <value></value>
+      <key>ant0</key>
+      <value>ant</value>
     </param>
     <param>
-      <key>bw11</key>
-      <value>0</value>
+      <key>bw0</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>center_freq12</key>
+      <key>center_freq1</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain12</key>
+      <key>gain1</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant12</key>
+      <key>ant1</key>
       <value></value>
     </param>
     <param>
-      <key>bw12</key>
+      <key>bw1</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq13</key>
+      <key>center_freq2</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain13</key>
+      <key>gain2</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant13</key>
+      <key>ant2</key>
       <value></value>
     </param>
     <param>
-      <key>bw13</key>
+      <key>bw2</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq14</key>
+      <key>center_freq3</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain14</key>
+      <key>gain3</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant14</key>
+      <key>ant3</key>
       <value></value>
     </param>
     <param>
-      <key>bw14</key>
+      <key>bw3</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq15</key>
+      <key>center_freq4</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain15</key>
+      <key>gain4</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant15</key>
+      <key>ant4</key>
       <value></value>
     </param>
     <param>
-      <key>bw15</key>
+      <key>bw4</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq16</key>
+      <key>center_freq5</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain16</key>
+      <key>gain5</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant16</key>
+      <key>ant5</key>
       <value></value>
     </param>
     <param>
-      <key>bw16</key>
+      <key>bw5</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq17</key>
+      <key>center_freq6</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain17</key>
+      <key>gain6</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant17</key>
+      <key>ant6</key>
       <value></value>
     </param>
     <param>
-      <key>bw17</key>
+      <key>bw6</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq18</key>
+      <key>center_freq7</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain18</key>
+      <key>gain7</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant18</key>
+      <key>ant7</key>
       <value></value>
     </param>
     <param>
-      <key>bw18</key>
+      <key>bw7</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq19</key>
+      <key>center_freq8</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain19</key>
+      <key>gain8</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant19</key>
+      <key>ant8</key>
       <value></value>
     </param>
     <param>
-      <key>bw19</key>
+      <key>bw8</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq20</key>
+      <key>center_freq9</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain20</key>
+      <key>gain9</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant20</key>
+      <key>ant9</key>
       <value></value>
     </param>
     <param>
-      <key>bw20</key>
+      <key>bw9</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq21</key>
+      <key>center_freq10</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain21</key>
+      <key>gain10</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant21</key>
+      <key>ant10</key>
       <value></value>
     </param>
     <param>
-      <key>bw21</key>
+      <key>bw10</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq22</key>
+      <key>center_freq11</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain22</key>
+      <key>gain11</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant22</key>
+      <key>ant11</key>
       <value></value>
     </param>
     <param>
-      <key>bw22</key>
+      <key>bw11</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq23</key>
+      <key>center_freq12</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain23</key>
+      <key>gain12</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant23</key>
+      <key>ant12</key>
       <value></value>
     </param>
     <param>
-      <key>bw23</key>
+      <key>bw12</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq24</key>
+      <key>center_freq13</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain24</key>
+      <key>gain13</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant24</key>
+      <key>ant13</key>
       <value></value>
     </param>
     <param>
-      <key>bw24</key>
+      <key>bw13</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq25</key>
+      <key>center_freq14</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain25</key>
+      <key>gain14</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant25</key>
+      <key>ant14</key>
       <value></value>
     </param>
     <param>
-      <key>bw25</key>
+      <key>bw14</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq26</key>
+      <key>center_freq15</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain26</key>
+      <key>gain15</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant26</key>
+      <key>ant15</key>
       <value></value>
     </param>
     <param>
-      <key>bw26</key>
+      <key>bw15</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq27</key>
+      <key>center_freq16</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain27</key>
+      <key>gain16</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant27</key>
+      <key>ant16</key>
       <value></value>
     </param>
     <param>
-      <key>bw27</key>
+      <key>bw16</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq28</key>
+      <key>center_freq17</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain28</key>
+      <key>gain17</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant28</key>
+      <key>ant17</key>
       <value></value>
     </param>
     <param>
-      <key>bw28</key>
+      <key>bw17</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq29</key>
+      <key>center_freq18</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain29</key>
+      <key>gain18</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant29</key>
+      <key>ant18</key>
       <value></value>
     </param>
     <param>
-      <key>bw29</key>
+      <key>bw18</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq30</key>
+      <key>center_freq19</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain30</key>
+      <key>gain19</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant30</key>
+      <key>ant19</key>
       <value></value>
     </param>
     <param>
-      <key>bw30</key>
+      <key>bw19</key>
       <value>0</value>
     </param>
     <param>
-      <key>center_freq31</key>
+      <key>center_freq20</key>
       <value>0</value>
     </param>
     <param>
-      <key>gain31</key>
+      <key>gain20</key>
       <value>0</value>
     </param>
     <param>
-      <key>ant31</key>
+      <key>ant20</key>
       <value></value>
     </param>
     <param>
-      <key>bw31</key>
+      <key>bw20</key>
       <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(37, 394)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
+      <key>center_freq21</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_function_probe</key>
-    <param>
-      <key>id</key>
-      <value>chan0_lo_locked</value>
-    </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>gain21</key>
+      <value>0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>uhd.sensor_value("", False, "")</value>
+      <key>ant21</key>
+      <value></value>
     </param>
     <param>
-      <key>block_id</key>
-      <value>uhd_usrp_source_0</value>
+      <key>bw21</key>
+      <value>0</value>
     </param>
     <param>
-      <key>function_name</key>
-      <value>get_sensor</value>
+      <key>center_freq22</key>
+      <value>0</value>
     </param>
     <param>
-      <key>function_args</key>
-      <value>"'lo_locked'"</value>
+      <key>gain22</key>
+      <value>0</value>
     </param>
-    <param>
-      <key>poll_rate</key>
-      <value>10</value>
+    <param>
+      <key>ant22</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(583, 432)</value>
+      <key>bw22</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>center_freq23</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>notebook</key>
     <param>
-      <key>id</key>
-      <value>nb0</value>
+      <key>gain23</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>ant23</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.NB_TOP</value>
+      <key>bw23</key>
+      <value>0</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>['FFT', 'Waterfall', 'Scope']</value>
+      <key>center_freq24</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 8</value>
+      <key>gain24</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>ant24</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(15, 172)</value>
+      <key>bw24</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>center_freq25</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_chooser</key>
     <param>
-      <key>id</key>
-      <value>ant_xcvr</value>
+      <key>gain25</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>False</value>
+      <key>ant25</key>
+      <value></value>
     </param>
     <param>
-      <key>label</key>
-      <value>Antenna</value>
+      <key>bw25</key>
+      <value>0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>"J2"</value>
+      <key>center_freq26</key>
+      <value>0</value>
     </param>
     <param>
-      <key>choices</key>
-      <value>["J2","J1"]</value>
+      <key>gain26</key>
+      <value>0</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>["J2","J1"]</value>
+      <key>ant26</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>radio_buttons</value>
+      <key>bw26</key>
+      <value>0</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
+      <key>center_freq27</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>gain27</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>ant27</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(830, 278)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
+      <key>bw27</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_static_text</key>
     <param>
-      <key>id</key>
-      <value>lo_locked_probe</value>
+      <key>center_freq28</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>gain28</key>
+      <value>0</value>
     </param>
     <param>
-      <key>label</key>
-      <value>LO Locked</value>
+      <key>ant28</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>chan0_lo_locked.to_bool()</value>
+      <key>bw28</key>
+      <value>0</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>str_converter</value>
+      <key>center_freq29</key>
+      <value>0</value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>lambda x: x and "True" or "False"</value>
+      <key>gain29</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 7, 1, 1</value>
+      <key>ant29</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>bw29</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(583, 314)</value>
+      <key>center_freq30</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>gain30</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>variable_chooser</key>
     <param>
-      <key>id</key>
-      <value>ant</value>
+      <key>ant30</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>bw30</key>
+      <value>0</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Antenna</value>
+      <key>center_freq31</key>
+      <value>0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>"RX2"</value>
+      <key>gain31</key>
+      <value>0</value>
     </param>
     <param>
-      <key>choices</key>
-      <value>["RX2","TX/RX"]</value>
+      <key>ant31</key>
+      <value></value>
     </param>
     <param>
-      <key>labels</key>
-      <value>["RX2","TX/RX"]</value>
+      <key>bw31</key>
+      <value>0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>radio_buttons</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.RA_HORIZONTAL</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 4, 1, 2</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(830, 130)</value>
+      <value>(33, 295)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1146,10 +1746,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_time_sink_x</key>
     <param>
       <key>id</key>
-      <value>fft</value>
+      <value>qtgui_time_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1160,347 +1760,320 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>name</key>
+      <value>QT GUI Plot</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>size</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>freq</value>
+      <key>srate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>autoscale</key>
+      <value>True</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>15</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>entags</key>
+      <value>True</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>gui_hint</key>
+      <value>address@hidden:3,0,1,4</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>tr_level</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value>(-1, 400)</value>
+      <key>tr_delay</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>nb0, 0</value>
+      <key>tr_tag</key>
+      <value>""</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(314, 359)</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_waterfallsink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_waterfallsink2_0</value>
+      <key>style1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker1</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Waterfall Plot</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>dynamic_range</key>
-      <value>100</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>512</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value>(-1, 400)</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value>nb0, 1</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(313, 573)</value>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>marker4</key>
+      <value>-1</value>
     </param>
-  </block>
-  <block>
-    <key>variable_text_box</key>
     <param>
-      <key>id</key>
-      <value>samp_rate</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>label</key>
-      <value>Sample Rate</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>param_samp_rate</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>formatter</key>
-      <value>None</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 3</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label6</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(358, 129)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>freq</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>style6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>RX Tune Frequency</value>
+      <key>marker6</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>param_freq</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>50e6</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>max</key>
-      <value>6e9</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>1000</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>style7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>marker7</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>3, 0, 1, 8</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(510, 128)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>gain</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>style8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>RX Gain</value>
+      <key>marker8</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>param_gain</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>max</key>
-      <value>31.5</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>63</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>style9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>marker9</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 1, 8</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(679, 130)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>address</value>
+      <key>color10</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>style10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>label</key>
-      <value>IP Address</value>
+      <key>marker10</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>addr=192.168.11.2</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>a</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(190, 15)</value>
+      <value>(333, 436)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1509,19 +2082,19 @@
   </block>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_scopesink2_0</sink_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_waterfallsink2_0</sink_block_id>
+    <sink_block_id>qtgui_waterfall_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>fft</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-uhd/examples/grc/uhd_rx_dpsk.grc 
b/gr-uhd/examples/grc/uhd_rx_dpsk.grc
index 8a9faa4..96b92c4 100644
--- a/gr-uhd/examples/grc/uhd_rx_dpsk.grc
+++ b/gr-uhd/examples/grc/uhd_rx_dpsk.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Mar 18 11:10:25 2013</timestamp>
+  <timestamp>Sat Jul 12 15:58:45 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(12, 9)</value>
+      <value>(-1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +68,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>samps_per_sym</value>
+      <value>rolloff</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +76,15 @@
     </param>
     <param>
       <key>value</key>
-      <value>4</value>
+      <value>.35</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(12, 88)</value>
+      <value>(570, 579)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,34 +92,26 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>samp_rate</value>
+      <value>samps_per_sym</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Sample Rate</value>
-    </param>
-    <param>
       <key>value</key>
-      <value>1e6</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <value>4</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>s</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(339, 11)</value>
+      <value>(881, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -119,34 +119,26 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>freq</value>
+      <value>nfilts</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default Frequency</value>
-    </param>
-    <param>
       <key>value</key>
-      <value>2.45e9</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <value>32</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>f</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(466, 11)</value>
+      <value>(657, 579)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -157,7 +149,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>gain</value>
+      <value>address</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -165,23 +157,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default Gain</value>
+      <value>IP Address</value>
     </param>
     <param>
       <key>value</key>
-      <value>0</value>
+      <value>addr=192.168.10.2</value>
     </param>
     <param>
       <key>type</key>
-      <value>eng_float</value>
+      <value>string</value>
     </param>
     <param>
       <key>short_id</key>
-      <value>g</value>
+      <value>a</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(624, 14)</value>
+      <value>(158, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -192,7 +188,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>address</value>
+      <value>gain</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -200,23 +196,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>IP Address</value>
+      <value>Default Gain</value>
     </param>
     <param>
       <key>value</key>
-      <value>addr=192.168.10.2</value>
+      <value>0</value>
     </param>
     <param>
       <key>type</key>
-      <value>string</value>
+      <value>eng_float</value>
     </param>
     <param>
       <key>short_id</key>
-      <value>a</value>
+      <value>g</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(186, 10)</value>
+      <value>(596, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -227,7 +227,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -235,11 +235,11 @@
     </param>
     <param>
       <key>label</key>
-      <value>Rx Frequency Offset</value>
+      <value>Default Frequency</value>
     </param>
     <param>
       <key>value</key>
-      <value>0</value>
+      <value>2.45e9</value>
     </param>
     <param>
       <key>type</key>
@@ -247,11 +247,15 @@
     </param>
     <param>
       <key>short_id</key>
-      <value>o</value>
+      <value>f</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(748, 15)</value>
+      <value>(438, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -259,10 +263,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>tun_freq</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -270,43 +274,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>Freq (Hz)</value>
+      <value>Sample Rate</value>
     </param>
     <param>
       <key>value</key>
-      <value>freq</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>2.4e9</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>2.5e9</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <value>1e6</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>type</key>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>short_id</key>
+      <value>s</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(12, 436)</value>
+      <value>(311, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -314,26 +302,38 @@
     </param>
   </block>
   <block>
-    <key>blocks_null_sink</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>blocks_null_sink_0</value>
+      <value>freq_offset</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>label</key>
+      <value>Rx Frequency Offset</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>type</key>
-      <value>byte</value>
+      <value>eng_float</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>short_id</key>
+      <value>o</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(615, 144)</value>
+      <value>(720, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -341,10 +341,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>timing_bw</value>
+      <value>tun_freq</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -352,43 +352,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Timing Loop BW</value>
+      <value>UHD Freq (Hz)</value>
     </param>
     <param>
       <key>value</key>
-      <value>6.28/100.0</value>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>start</key>
+      <value>2.4e9</value>
     </param>
     <param>
-      <key>max</key>
+      <key>stop</key>
+      <value>2.5e9</value>
+    </param>
+    <param>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(604, 436)</value>
+      <value>(6, 448)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -396,10 +400,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>phase_bw</value>
+      <value>rx_freq_off</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -407,43 +411,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Phase Loop BW</value>
+      <value>Rx Freq Offset (Hz)</value>
     </param>
     <param>
       <key>value</key>
-      <value>6.28/100.0</value>
+      <value>0</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>start</key>
+      <value>-100e3</value>
     </param>
     <param>
-      <key>max</key>
-      <value>1.0</value>
+      <key>stop</key>
+      <value>100e3</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(461, 436)</value>
+      <value>(134, 448)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -451,78 +459,58 @@
     </param>
   </block>
   <block>
-    <key>wxgui_constellationsink2</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>wxgui_constellationsink2_0</value>
+      <value>tun_gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Constellation Plot</value>
-    </param>
-    <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>frame_rate</key>
-      <value>5</value>
-    </param>
-    <param>
-      <key>const_size</key>
-      <value>2048</value>
-    </param>
-    <param>
-      <key>M</key>
-      <value>4</value>
+      <key>label</key>
+      <value>UHD Tx Gain</value>
     </param>
     <param>
-      <key>theta</key>
+      <key>value</key>
       <value>0</value>
     </param>
     <param>
-      <key>loop_bw</key>
-      <value>6.28/100.0</value>
-    </param>
-    <param>
-      <key>fmax</key>
-      <value>0.06</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>mu</key>
-      <value>0.5</value>
+      <key>stop</key>
+      <value>20</value>
     </param>
     <param>
-      <key>gain_mu</key>
-      <value>0.005</value>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>symbol_rate</key>
-      <value>samp_rate/samps_per_sym</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>omega_limit</key>
-      <value>0.005</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(931, 313)</value>
+      <value>(286, 447)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -530,10 +518,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>uhd_usrp_source</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>uhd_usrp_source_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -541,379 +529,127 @@
     </param>
     <param>
       <key>type</key>
-      <value>complex</value>
+      <value>fc32</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>otw</key>
+      <value></value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>stream_args</key>
+      <value></value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>tun_freq</value>
+      <key>stream_chans</key>
+      <value>[]</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>dev_addr</key>
+      <value>address</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>dev_args</key>
+      <value>""</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>10</value>
+      <key>sync</key>
+      <value></value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>clock_rate</key>
+      <value>0.0</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>num_mboards</key>
+      <value>1</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>clock_source0</key>
+      <value></value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>time_source0</key>
+      <value></value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>sd_spec0</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>clock_source1</key>
+      <value></value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>time_source1</key>
+      <value></value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>sd_spec1</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>clock_source2</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>time_source2</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>sd_spec2</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(710, 236)</value>
+      <key>clock_source3</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>time_source3</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>digital_dxpsk_demod</key>
     <param>
-      <key>id</key>
-      <value>digital_dxpsk_demod_0</value>
+      <key>sd_spec3</key>
+      <value></value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>clock_source4</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>dqpsk</value>
+      <key>time_source4</key>
+      <value></value>
     </param>
     <param>
-      <key>samples_per_symbol</key>
-      <value>samps_per_sym</value>
+      <key>sd_spec4</key>
+      <value></value>
     </param>
     <param>
-      <key>excess_bw</key>
-      <value>0.35</value>
+      <key>clock_source5</key>
+      <value></value>
     </param>
     <param>
-      <key>freq_bw</key>
-      <value>6.28/100.0</value>
+      <key>time_source5</key>
+      <value></value>
     </param>
     <param>
-      <key>phase_bw</key>
-      <value>6.28/100.0</value>
+      <key>sd_spec5</key>
+      <value></value>
     </param>
     <param>
-      <key>timing_bw</key>
-      <value>6.28/100.0</value>
+      <key>clock_source6</key>
+      <value></value>
     </param>
     <param>
-      <key>mod_code</key>
-      <value>"gray"</value>
+      <key>time_source6</key>
+      <value></value>
     </param>
     <param>
-      <key>verbose</key>
-      <value>False</value>
+      <key>sd_spec6</key>
+      <value></value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>sync_out</key>
-      <value>False</value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(303, 154)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>rx_freq_off</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>RX Freq Offset (Hz)</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>freq_offset</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>-100e3</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>+100e3</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(149, 437)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
-    <param>
-      <key>id</key>
-      <value>tun_gain</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>UHD Gain</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>gain</value>
-    </param>
-    <param>
-      <key>min</key>
-      <value>0</value>
-    </param>
-    <param>
-      <key>max</key>
-      <value>20</value>
-    </param>
-    <param>
-      <key>num_steps</key>
-      <value>100</value>
-    </param>
-    <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
-    </param>
-    <param>
-      <key>converver</key>
-      <value>float_converter</value>
-    </param>
-    <param>
-      <key>grid_pos</key>
-      <value></value>
-    </param>
-    <param>
-      <key>notebook</key>
-      <value></value>
-    </param>
-    <param>
-      <key>_coordinate</key>
-      <value>(306, 438)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>uhd_usrp_source</key>
-    <param>
-      <key>id</key>
-      <value>uhd_usrp_source_0</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>type</key>
-      <value>fc32</value>
-    </param>
-    <param>
-      <key>otw</key>
-      <value></value>
-    </param>
-    <param>
-      <key>stream_args</key>
-      <value></value>
-    </param>
-    <param>
-      <key>dev_addr</key>
-      <value>address</value>
-    </param>
-    <param>
-      <key>sync</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_rate</key>
-      <value>0.0</value>
-    </param>
-    <param>
-      <key>num_mboards</key>
-      <value>1</value>
-    </param>
-    <param>
-      <key>clock_source0</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source0</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec0</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source1</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source1</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec1</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source2</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source2</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec2</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source3</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source3</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec3</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source4</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source4</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec4</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source5</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source5</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec5</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source6</key>
-      <value></value>
-    </param>
-    <param>
-      <key>time_source6</key>
-      <value></value>
-    </param>
-    <param>
-      <key>sd_spec6</key>
-      <value></value>
-    </param>
-    <param>
-      <key>clock_source7</key>
-      <value></value>
+      <key>clock_source7</key>
+      <value></value>
     </param>
     <param>
       <key>time_source7</key>
@@ -1444,35 +1180,402 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(18, 276)</value>
+      <value>(0, 143)</value>
     </param>
     <param>
       <key>_rotation</key>
       <value>0</value>
     </param>
   </block>
-  <connection>
-    <source_block_id>digital_dxpsk_demod_0</source_block_id>
-    <sink_block_id>blocks_null_sink_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>digital_dxpsk_demod_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
-    <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_constellationsink2_0</sink_block_id>
+  <block>
+    <key>blocks_null_sink</key>
+    <param>
+      <key>id</key>
+      <value>blocks_null_sink_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>bus_conns</key>
+      <value>[[0,],]</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(620, 168)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>digital_dxpsk_demod</key>
+    <param>
+      <key>id</key>
+      <value>digital_dxpsk_demod_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>dqpsk</value>
+    </param>
+    <param>
+      <key>samples_per_symbol</key>
+      <value>samps_per_sym</value>
+    </param>
+    <param>
+      <key>excess_bw</key>
+      <value>0.35</value>
+    </param>
+    <param>
+      <key>freq_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>phase_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>timing_bw</key>
+      <value>6.28/100.0</value>
+    </param>
+    <param>
+      <key>mod_code</key>
+      <value>"gray"</value>
+    </param>
+    <param>
+      <key>verbose</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>sync_out</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(325, 112)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_freq_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_freq_sink_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>tun_freq</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(340, 283)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>digital_dxpsk_demod_0</source_block_id>
+    <sink_block_id>blocks_null_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+  <connection>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>digital_dxpsk_demod_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-uhd/examples/grc/uhd_two_tone_loopback.grc 
b/gr-uhd/examples/grc/uhd_two_tone_loopback.grc
index 1884dd3..f164d85 100644
--- a/gr-uhd/examples/grc/uhd_two_tone_loopback.grc
+++ b/gr-uhd/examples/grc/uhd_two_tone_loopback.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 14:55:26 2012</timestamp>
+  <timestamp>Sat Jul 12 14:48:02 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +68,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>tx_gain</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,7 +76,85 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default TX Gain</value>
+      <value>Sample Rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>500e3</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>s</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(523, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>rx_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Default RX Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(1123, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>freq_offset</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Rx Frequency Offset</value>
     </param>
     <param>
       <key>value</key>
@@ -84,11 +166,15 @@
     </param>
     <param>
       <key>short_id</key>
+      <value>o</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(999, 11)</value>
+      <value>(804, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -122,8 +208,12 @@
       <value>f</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(665, 11)</value>
+      <value>(649, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -134,7 +224,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>freq_offset</value>
+      <value>tx_gain</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -142,7 +232,7 @@
     </param>
     <param>
       <key>label</key>
-      <value>Rx Frequency Offset</value>
+      <value>Default TX Gain</value>
     </param>
     <param>
       <key>value</key>
@@ -154,11 +244,15 @@
     </param>
     <param>
       <key>short_id</key>
-      <value>o</value>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(820, 11)</value>
+      <value>(983, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -169,7 +263,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>address1</value>
+      <value>address0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -177,11 +271,11 @@
     </param>
     <param>
       <key>label</key>
-      <value>IP Address, Dev 1</value>
+      <value>IP Address, Dev 0</value>
     </param>
     <param>
       <key>value</key>
-      <value>addr=192.168.11.2</value>
+      <value>addr=192.168.10.2</value>
     </param>
     <param>
       <key>type</key>
@@ -192,8 +286,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(353, 14)</value>
+      <value>(177, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -204,7 +302,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>address0</value>
+      <value>address1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -212,7 +310,7 @@
     </param>
     <param>
       <key>label</key>
-      <value>IP Address, Dev 0</value>
+      <value>IP Address, Dev 1</value>
     </param>
     <param>
       <key>value</key>
@@ -227,8 +325,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(193, 14)</value>
+      <value>(337, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -236,10 +338,10 @@
     </param>
   </block>
   <block>
-    <key>uhd_usrp_sink</key>
+    <key>uhd_usrp_source</key>
     <param>
       <key>id</key>
-      <value>uhd_usrp_sink_0</value>
+      <value>uhd_usrp_source_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -258,8 +360,16 @@
       <value></value>
     </param>
     <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
       <key>dev_addr</key>
-      <value>address0</value>
+      <value>address1</value>
+    </param>
+    <param>
+      <key>dev_args</key>
+      <value>""</value>
     </param>
     <param>
       <key>sync</key>
@@ -283,7 +393,7 @@
     </param>
     <param>
       <key>sd_spec0</key>
-      <value></value>
+      <value>B:0</value>
     </param>
     <param>
       <key>clock_source1</key>
@@ -890,8 +1000,24 @@
       <value>0</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(669, 178)</value>
+      <value>(813, 281)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -899,34 +1025,50 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>analog_noise_source_x</key>
     <param>
       <key>id</key>
-      <value>rx_gain</value>
+      <value>analog_noise_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default RX Gain</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
-      <value>0</value>
+      <key>noise_type</key>
+      <value>analog.GR_GAUSSIAN</value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>amp</key>
+      <value>noise_ampl</value>
     </param>
     <param>
-      <key>short_id</key>
+      <key>seed</key>
+      <value>-42</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(1139, 12)</value>
+      <value>(551, 324)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -934,54 +1076,58 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>analog_sig_source_x</key>
     <param>
       <key>id</key>
-      <value>tone1</value>
+      <value>analog_sig_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Tone 1</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
-      <value>50e3</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-samp_rate/2</value>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
     </param>
     <param>
-      <key>max</key>
-      <value>samp_rate/2</value>
+      <key>freq</key>
+      <value>tone1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>amp</key>
+      <value>tone_ampl</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>offset</key>
+      <value>0</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 4</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(161, 484)</value>
+      <value>(541, 98)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -989,54 +1135,105 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>analog_sig_source_x</key>
     <param>
       <key>id</key>
-      <value>tone2</value>
+      <value>analog_sig_source_x_1</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Tone 2</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
-      <value>75e3</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-samp_rate/2</value>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
     </param>
     <param>
-      <key>max</key>
-      <value>samp_rate/2</value>
+      <key>freq</key>
+      <value>tone2</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>tone_ampl</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 4, 1, 4</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>_coordinate</key>
+      <value>(542, 209)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_add_xx</key>
+    <param>
+      <key>id</key>
+      <value>blocks_add_xx</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>3</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(308, 483)</value>
+      <value>(806, 134)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1044,164 +1241,238 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>tun_tx_gain</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>UHD TX Gain</value>
+      <key>type</key>
+      <value>complex</value>
+    </param>
+    <param>
+      <key>name</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>2,0,1,4</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>tx_gain</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>max</key>
-      <value>20</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>label4</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(655, 486)</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>tun_freq</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>label</key>
-      <value>Freq (Hz)</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>freq</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>min</key>
-      <value>2.4e9</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>2.5e9</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>label7</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
       <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(514, 487)</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
-  </block>
-  <block>
-    <key>variable_slider</key>
     <param>
-      <key>id</key>
-      <value>tun_rx_gain</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>label</key>
-      <value>UHD RX Gain</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>rx_gain</value>
+      <key>color9</key>
+      <value>"dark green"</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>20</value>
+      <key>label10</key>
+      <value></value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width10</key>
+      <value>1</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>alpha10</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(781, 487)</value>
+      <value>(1086, 281)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1209,10 +1480,10 @@
     </param>
   </block>
   <block>
-    <key>uhd_usrp_source</key>
+    <key>uhd_usrp_sink</key>
     <param>
       <key>id</key>
-      <value>uhd_usrp_source_0</value>
+      <value>uhd_usrp_sink_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1231,8 +1502,16 @@
       <value></value>
     </param>
     <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
       <key>dev_addr</key>
-      <value>address1</value>
+      <value>address0</value>
+    </param>
+    <param>
+      <key>dev_args</key>
+      <value>""</value>
     </param>
     <param>
       <key>sync</key>
@@ -1256,7 +1535,7 @@
     </param>
     <param>
       <key>sd_spec0</key>
-      <value></value>
+      <value>A:0</value>
     </param>
     <param>
       <key>clock_source1</key>
@@ -1863,8 +2142,20 @@
       <value>0</value>
     </param>
     <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(672, 320)</value>
+      <value>(949, 140)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1872,10 +2163,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>tone_ampl</value>
+      <value>tun_freq</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1883,43 +2174,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Tone Ampl</value>
+      <value>UHD Freq (Hz)</value>
     </param>
     <param>
       <key>value</key>
-      <value>0.15</value>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>start</key>
+      <value>2.4e9</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>2.5e9</value>
     </param>
     <param>
-      <key>max</key>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_VERTICAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 2, 1</value>
+      <key>gui_hint</key>
+      <value>3,0,1,4</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(14, 485)</value>
+      <value>(80, 431)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1927,10 +2222,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>noise_ampl</value>
+      <value>tone1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1938,43 +2233,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Noise Ampl</value>
+      <value>Tone 1</value>
     </param>
     <param>
       <key>value</key>
-      <value>0.1</value>
+      <value>samp_rate/4</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>start</key>
+      <value>-samp_rate/2</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>samp_rate/2</value>
     </param>
     <param>
-      <key>max</key>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_VERTICAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 1, 2, 1</value>
+      <key>gui_hint</key>
+      <value>0,0,1,2</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(15, 335)</value>
+      <value>(1, 131)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1982,125 +2281,117 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2</value>
+      <value>noise_ampl</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>label</key>
+      <value>Noise Amplitude</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>0.1</value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>step</key>
+      <value>.001</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>512*2</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>gui_hint</key>
+      <value>1,0,1,2</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>_coordinate</key>
+      <value>(0, 283)</value>
     </param>
     <param>
-      <key>avg_alpha</key>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
     <param>
-      <key>win</key>
-      <value>window.blackmanharris</value>
-    </param>
-    <param>
-      <key>win_size</key>
-      <value></value>
+      <key>id</key>
+      <value>tun_tx_gain</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 2, 2, 4</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>label</key>
+      <value>UHD Tx Gain</value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1114, 264)</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>stop</key>
+      <value>20</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>samp_rate</value>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Sample Rate</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>value</key>
-      <value>500e3</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>gui_hint</key>
+      <value>4,0,1,2</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>s</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(539, 11)</value>
+      <value>(-1, 573)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2108,42 +2399,58 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <value>tone2</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value>Tone 2</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>samp_rate/5</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>start</key>
+      <value>-samp_rate/2</value>
     </param>
     <param>
-      <key>freq</key>
-      <value>tone1</value>
+      <key>stop</key>
+      <value>samp_rate/2</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>tone_ampl</value>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,2,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(264, 136)</value>
+      <value>(126, 132)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2151,42 +2458,58 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_1</value>
+      <value>tone_ampl</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value>Tone Amplitude</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>0.15</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>freq</key>
-      <value>tone2</value>
+      <key>stop</key>
+      <value>1</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>tone_ampl</value>
+      <key>step</key>
+      <value>.001</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,2,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(265, 247)</value>
+      <value>(152, 286)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2194,65 +2517,58 @@
     </param>
   </block>
   <block>
-    <key>blocks_add_xx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>blocks_add_xx</value>
+      <value>tun_rx_gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
-    </param>
-    <param>
-      <key>num_inputs</key>
-      <value>3</value>
+      <key>label</key>
+      <value>UHD Rx Gain</value>
     </param>
     <param>
-      <key>vlen</key>
-      <value>1</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(529, 172)</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>stop</key>
+      <value>20</value>
     </param>
-  </block>
-  <block>
-    <key>analog_noise_source_x</key>
     <param>
-      <key>id</key>
-      <value>analog_noise_source_x_0</value>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>noise_type</key>
-      <value>analog.GR_GAUSSIAN</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>noise_ampl</value>
+      <key>gui_hint</key>
+      <value>4,2,1,2</value>
     </param>
     <param>
-      <key>seed</key>
-      <value>-42</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(288, 359)</value>
+      <value>(120, 571)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -2260,14 +2576,8 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blocks_add_xx</source_block_id>
-    <sink_block_id>uhd_usrp_sink_0</sink_block_id>
-    <source_key>0</source_key>
-    <sink_key>0</sink_key>
-  </connection>
-  <connection>
     <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2</sink_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -2289,4 +2599,10 @@
     <source_key>0</source_key>
     <sink_key>2</sink_key>
   </connection>
+  <connection>
+    <source_block_id>blocks_add_xx</source_block_id>
+    <sink_block_id>uhd_usrp_sink_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
 </flow_graph>
diff --git a/gr-uhd/examples/grc/uhd_tx_dpsk.grc 
b/gr-uhd/examples/grc/uhd_tx_dpsk.grc
index 5d57617..815d87b 100644
--- a/gr-uhd/examples/grc/uhd_tx_dpsk.grc
+++ b/gr-uhd/examples/grc/uhd_tx_dpsk.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Mar 18 11:11:06 2013</timestamp>
+  <timestamp>Sat Jul 12 14:07:03 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(-1, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,8 +79,12 @@
       <value>4</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 100)</value>
+      <value>(-1, 84)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,10 +92,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>ampl</value>
+      <value>gain</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -95,43 +103,66 @@
     </param>
     <param>
       <key>label</key>
-      <value>Amplitude</value>
+      <value>Default Gain</value>
     </param>
     <param>
       <key>value</key>
-      <value>.1</value>
+      <value>0</value>
     </param>
     <param>
-      <key>min</key>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>g</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(589, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>parameter</key>
     <param>
-      <key>max</key>
-      <value>1</value>
+      <key>id</key>
+      <value>freq</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>label</key>
+      <value>Default Frequency</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>value</key>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>f</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(7, 299)</value>
+      <value>(433, 1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -165,8 +196,12 @@
       <value>s</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(334, 15)</value>
+      <value>(304, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -177,7 +212,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>freq</value>
+      <value>address</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -185,23 +220,27 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default Frequency</value>
+      <value>IP Address</value>
     </param>
     <param>
       <key>value</key>
-      <value>2.45e9</value>
+      <value>addr=192.168.10.2</value>
     </param>
     <param>
       <key>type</key>
-      <value>eng_float</value>
+      <value>string</value>
     </param>
     <param>
       <key>short_id</key>
-      <value>f</value>
+      <value>a</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(463, 17)</value>
+      <value>(147, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -209,10 +248,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>tun_gain</value>
+      <value>ampl</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -220,43 +259,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>UHD Gain</value>
+      <value>Amplitude</value>
     </param>
     <param>
       <key>value</key>
-      <value>gain</value>
+      <value>0.1</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>20</value>
+      <key>stop</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>0.01</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(151, 441)</value>
+      <value>(-1, 307)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -264,7 +307,7 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
       <value>tun_freq</value>
@@ -275,43 +318,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>Freq (Hz)</value>
+      <value>UHD Freq (Hz)</value>
     </param>
     <param>
       <key>value</key>
-      <value>freq</value>
+      <value>2.45e9</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>2.4e9</value>
     </param>
     <param>
-      <key>max</key>
+      <key>stop</key>
       <value>2.5e9</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(7, 441)</value>
+      <value>(0, 436)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -319,38 +366,58 @@
     </param>
   </block>
   <block>
-    <key>analog_random_source_x</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>analog_random_source_x_0</value>
+      <value>tun_gain</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>byte</value>
+      <key>label</key>
+      <value>UHD Tx Gain</value>
     </param>
     <param>
-      <key>min</key>
+      <key>value</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>2**8</value>
+      <key>start</key>
+      <value>0</value>
     </param>
     <param>
-      <key>num_samps</key>
-      <value>1000</value>
+      <key>stop</key>
+      <value>20</value>
     </param>
     <param>
-      <key>repeat</key>
-      <value>True</value>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(177, 162)</value>
+      <value>(137, 435)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -358,10 +425,10 @@
     </param>
   </block>
   <block>
-    <key>digital_dxpsk_mod</key>
+    <key>analog_random_source_x</key>
     <param>
       <key>id</key>
-      <value>digital_dxpsk_mod_0</value>
+      <value>analog_random_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -369,31 +436,43 @@
     </param>
     <param>
       <key>type</key>
-      <value>dqpsk</value>
+      <value>byte</value>
     </param>
     <param>
-      <key>samples_per_symbol</key>
-      <value>samps_per_sym</value>
+      <key>min</key>
+      <value>0</value>
     </param>
     <param>
-      <key>excess_bw</key>
-      <value>0.35</value>
+      <key>max</key>
+      <value>2**8</value>
     </param>
     <param>
-      <key>mod_code</key>
-      <value>"gray"</value>
+      <key>num_samps</key>
+      <value>1000</value>
     </param>
     <param>
-      <key>verbose</key>
-      <value>False</value>
+      <key>repeat</key>
+      <value>True</value>
     </param>
     <param>
-      <key>log</key>
-      <value>False</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(366, 162)</value>
+      <value>(-1, 171)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -401,69 +480,58 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>digital_dxpsk_mod</key>
     <param>
       <key>id</key>
-      <value>gain</value>
+      <value>digital_dxpsk_mod_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Default Gain</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>0</value>
-    </param>
-    <param>
       <key>type</key>
-      <value>eng_float</value>
+      <value>dqpsk</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>g</value>
+      <key>samples_per_symbol</key>
+      <value>samps_per_sym</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(619, 15)</value>
+      <key>excess_bw</key>
+      <value>0.35</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>mod_code</key>
+      <value>"gray"</value>
     </param>
-  </block>
-  <block>
-    <key>parameter</key>
     <param>
-      <key>id</key>
-      <value>address</value>
+      <key>verbose</key>
+      <value>False</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>log</key>
+      <value>False</value>
     </param>
     <param>
-      <key>label</key>
-      <value>IP Address</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>addr=192.168.10.2</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>a</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(177, 14)</value>
+      <value>(190, 171)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -493,10 +561,18 @@
       <value></value>
     </param>
     <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
       <key>dev_addr</key>
       <value>address</value>
     </param>
     <param>
+      <key>dev_args</key>
+      <value>""</value>
+    </param>
+    <param>
       <key>sync</key>
       <value></value>
     </param>
@@ -1125,8 +1201,20 @@
       <value>0</value>
     </param>
     <param>
+      <key>len_tag_name</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(783, 162)</value>
+      <value>(617, 163)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1156,8 +1244,24 @@
       <value>1</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(566, 186)</value>
+      <value>(388, 193)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1165,10 +1269,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1179,76 +1283,224 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
+      <key>name</key>
       <value>Transmit Spectrum</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>fftsize</key>
+      <value>1024</value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
       <value>tun_freq</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>average</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>y_divs</key>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
       <value>10</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>gui_hint</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>20</value>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label3</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(827, 299)</value>
+      <value>(619, 285)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1263,19 +1515,19 @@
   </connection>
   <connection>
     <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <sink_block_id>uhd_usrp_sink_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
-    <sink_block_id>uhd_usrp_sink_0</sink_block_id>
+    <source_block_id>digital_dxpsk_mod_0</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>digital_dxpsk_mod_0</source_block_id>
-    <sink_block_id>blocks_multiply_const_vxx_0</sink_block_id>
+    <source_block_id>blocks_multiply_const_vxx_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/gr-uhd/examples/grc/uhd_wbfm_receive.grc 
b/gr-uhd/examples/grc/uhd_wbfm_receive.grc
index e19015a..153dbd9 100644
--- a/gr-uhd/examples/grc/uhd_wbfm_receive.grc
+++ b/gr-uhd/examples/grc/uhd_wbfm_receive.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Mon Mar 18 11:13:02 2013</timestamp>
+  <timestamp>Sat Jul 12 14:40:24 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,39 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(-2, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>audio_decim</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(607, 192)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +95,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>gain</value>
+      <value>address</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,23 +103,66 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default Gain</value>
+      <value>IP Address</value>
     </param>
     <param>
       <key>value</key>
+      <value>addr=192.168.10.2</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>string</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>a</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(162, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>parameter</key>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>Sample Rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>400e3</value>
+    </param>
     <param>
       <key>type</key>
       <value>eng_float</value>
     </param>
     <param>
       <key>short_id</key>
-      <value>g</value>
+      <value>s</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(631, 15)</value>
+      <value>(315, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -99,7 +173,7 @@
     <key>parameter</key>
     <param>
       <key>id</key>
-      <value>freq</value>
+      <value>gain</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -107,11 +181,11 @@
     </param>
     <param>
       <key>label</key>
-      <value>Default Frequency</value>
+      <value>Default Gain</value>
     </param>
     <param>
       <key>value</key>
-      <value>93.3e6</value>
+      <value>0</value>
     </param>
     <param>
       <key>type</key>
@@ -119,11 +193,15 @@
     </param>
     <param>
       <key>short_id</key>
-      <value>f</value>
+      <value>g</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(479, 15)</value>
+      <value>(594, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -131,10 +209,10 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>tun_freq</value>
+      <value>audio_output</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -142,43 +220,70 @@
     </param>
     <param>
       <key>label</key>
-      <value>Freq (Hz)</value>
+      <value>Audio Output Device</value>
     </param>
     <param>
       <key>value</key>
-      <value>freq</value>
+      <value></value>
     </param>
     <param>
-      <key>min</key>
-      <value>87.9e6</value>
+      <key>type</key>
+      <value>string</value>
     </param>
     <param>
-      <key>max</key>
-      <value>108.1e6</value>
+      <key>short_id</key>
+      <value>O</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>_coordinate</key>
+      <value>(732, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_wfm_rcv</key>
+    <param>
+      <key>id</key>
+      <value>analog_wfm_rcv</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>quad_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>audio_decimation</key>
+      <value>audio_decim</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(15, 441)</value>
+      <value>(597, 127)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -186,54 +291,89 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>audio_sink</key>
     <param>
       <key>id</key>
-      <value>fine</value>
+      <value>audio_sink</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Fine Freq (MHz)</value>
+      <key>samp_rate</key>
+      <value>int(samp_rate/audio_decim)</value>
     </param>
     <param>
-      <key>value</key>
+      <key>device_name</key>
+      <value>audio_output</value>
+    </param>
+    <param>
+      <key>ok_to_block</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>num_inputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(995, 135)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_multiply_const_vxx</key>
     <param>
-      <key>min</key>
-      <value>-.1</value>
+      <key>id</key>
+      <value>blocks_multiply_const_vxx</value>
     </param>
     <param>
-      <key>max</key>
-      <value>.1</value>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>const</key>
+      <value>volume</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 2, 1, 2</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(277, 444)</value>
+      <value>(808, 135)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -241,54 +381,70 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>low_pass_filter</key>
     <param>
       <key>id</key>
-      <value>tun_gain</value>
+      <value>low_pass_filter_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>UHD Gain</value>
+      <key>type</key>
+      <value>fir_filter_ccf</value>
     </param>
     <param>
-      <key>value</key>
-      <value>gain</value>
+      <key>decim</key>
+      <value>1</value>
     </param>
     <param>
-      <key>min</key>
-      <value>0</value>
+      <key>interp</key>
+      <value>1</value>
     </param>
     <param>
-      <key>max</key>
-      <value>20</value>
+      <key>gain</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>cutoff_freq</key>
+      <value>115e3</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>width</key>
+      <value>30e3</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>win</key>
+      <value>firdes.WIN_HANN</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>beta</key>
+      <value>6.76</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(158, 440)</value>
+      <value>(261, 116)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -296,7 +452,7 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
       <value>volume</value>
@@ -314,36 +470,40 @@
       <value>1</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
+      <key>stop</key>
       <value>10</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>step</key>
+      <value>0.1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>min_len</key>
+      <value>200</value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>gui_hint</key>
       <value>1, 0, 1, 4</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(436, 446)</value>
+      <value>(802, 188)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -351,30 +511,117 @@
     </param>
   </block>
   <block>
-    <key>blocks_multiply_const_vxx</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>blocks_multiply_const_vxx</value>
+      <value>fine</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label</key>
+      <value>Fine Freq (MHz)</value>
     </param>
     <param>
-      <key>const</key>
-      <value>volume</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>start</key>
+      <value>-.1</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>.1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>.01</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,2,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(253, 277)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable_qtgui_range</key>
+    <param>
+      <key>id</key>
+      <value>tun_gain</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>label</key>
+      <value>UHD Gain</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>start</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>20</value>
+    </param>
+    <param>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(836, 161)</value>
+      <value>(141, 275)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -404,10 +651,18 @@
       <value></value>
     </param>
     <param>
+      <key>stream_chans</key>
+      <value>[]</value>
+    </param>
+    <param>
       <key>dev_addr</key>
       <value>address</value>
     </param>
     <param>
+      <key>dev_args</key>
+      <value>""</value>
+    </param>
+    <param>
       <key>sync</key>
       <value></value>
     </param>
@@ -525,7 +780,7 @@
     </param>
     <param>
       <key>center_freq0</key>
-      <value>tun_freq+fine</value>
+      <value>(tun_freq+fine)*1e6</value>
     </param>
     <param>
       <key>gain0</key>
@@ -1036,43 +1291,24 @@
       <value>0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(14, 165)</value>
-    </param>
-    <param>
-      <key>_rotation</key>
-      <value>0</value>
-    </param>
-  </block>
-  <block>
-    <key>parameter</key>
-    <param>
-      <key>id</key>
-      <value>samp_rate</value>
-    </param>
-    <param>
-      <key>_enabled</key>
-      <value>True</value>
-    </param>
-    <param>
-      <key>label</key>
-      <value>Sample Rate</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>value</key>
-      <value>400e3</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>eng_float</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>s</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(352, 15)</value>
+      <value>(0, 139)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1080,238 +1316,238 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>audio_output</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Audio Output Device</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>value</key>
-      <value></value>
+      <key>name</key>
+      <value>FFT Plot</value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>fftsize</key>
+      <value>512</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>O</value>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(769, 13)</value>
+      <key>fc</key>
+      <value>(tun_freq+fine)*1e6</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>bw</key>
+      <value>samp_rate</value>
     </param>
-  </block>
-  <block>
-    <key>audio_sink</key>
     <param>
-      <key>id</key>
-      <value>audio_sink</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>average</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>int(samp_rate/audio_decim)</value>
+      <key>ymin</key>
+      <value>-140</value>
     </param>
     <param>
-      <key>device_name</key>
-      <value>audio_output</value>
+      <key>ymax</key>
+      <value>10</value>
     </param>
     <param>
-      <key>ok_to_block</key>
-      <value>True</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_inputs</key>
-      <value>1</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(1023, 161)</value>
+      <key>gui_hint</key>
+      <value>2,0,2,4</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>label1</key>
+      <value></value>
     </param>
-  </block>
-  <block>
-    <key>low_pass_filter</key>
     <param>
-      <key>id</key>
-      <value>low_pass_filter_0</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>type</key>
-      <value>fir_filter_ccf</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>decim</key>
-      <value>1</value>
+      <key>label2</key>
+      <value></value>
     </param>
     <param>
-      <key>interp</key>
+      <key>width2</key>
       <value>1</value>
     </param>
     <param>
-      <key>gain</key>
-      <value>1</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>cutoff_freq</key>
-      <value>115e3</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>width</key>
-      <value>30e3</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>firdes.WIN_HANN</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
     <param>
-      <key>beta</key>
-      <value>6.76</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(326, 141)</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>audio_decim</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>10</value>
+      <key>label5</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(19, 351)</value>
+      <key>width5</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
-  </block>
-  <block>
-    <key>wxgui_fftsink2</key>
     <param>
-      <key>id</key>
-      <value>wxgui_fftsink2</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>color6</key>
+      <value>"magenta"</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>alpha6</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>(freq+fine)</value>
+      <key>label7</key>
+      <value></value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>width7</key>
+      <value>1</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>10</value>
+      <key>color7</key>
+      <value>"yellow"</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>0</value>
+      <key>alpha7</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>label8</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>512</value>
+      <key>width8</key>
+      <value>1</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>color8</key>
+      <value>"dark red"</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>alpha8</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>label9</key>
+      <value></value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>width9</key>
+      <value>1</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label10</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 2, 4</value>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(624, 278)</value>
+      <value>(598, 272)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1319,26 +1555,38 @@
     </param>
   </block>
   <block>
-    <key>analog_wfm_rcv</key>
+    <key>parameter</key>
     <param>
       <key>id</key>
-      <value>analog_wfm_rcv</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>quad_rate</key>
-      <value>samp_rate</value>
+      <key>label</key>
+      <value>Default Frequency</value>
     </param>
     <param>
-      <key>audio_decimation</key>
-      <value>audio_decim</value>
+      <key>value</key>
+      <value>93.3e6</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>eng_float</value>
+    </param>
+    <param>
+      <key>short_id</key>
+      <value>f</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(625, 153)</value>
+      <value>(442, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1346,10 +1594,10 @@
     </param>
   </block>
   <block>
-    <key>parameter</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>address</value>
+      <value>tun_freq</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -1357,23 +1605,47 @@
     </param>
     <param>
       <key>label</key>
-      <value>IP Address</value>
+      <value>UHD Freq (MHz)</value>
     </param>
     <param>
       <key>value</key>
-      <value>addr=192.168.10.2</value>
+      <value>freq/1e6</value>
     </param>
     <param>
-      <key>type</key>
-      <value>string</value>
+      <key>start</key>
+      <value>87.9</value>
     </param>
     <param>
-      <key>short_id</key>
-      <value>a</value>
+      <key>stop</key>
+      <value>108.1</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,0,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(199, 14)</value>
+      <value>(6, 276)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -1381,14 +1653,14 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blocks_multiply_const_vxx</source_block_id>
-    <sink_block_id>audio_sink</sink_block_id>
+    <source_block_id>low_pass_filter_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_wfm_rcv</source_block_id>
-    <sink_block_id>blocks_multiply_const_vxx</sink_block_id>
+    <source_block_id>uhd_usrp_source_0</source_block_id>
+    <sink_block_id>low_pass_filter_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
@@ -1399,14 +1671,14 @@
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>uhd_usrp_source_0</source_block_id>
-    <sink_block_id>low_pass_filter_0</sink_block_id>
+    <source_block_id>analog_wfm_rcv</source_block_id>
+    <sink_block_id>blocks_multiply_const_vxx</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>low_pass_filter_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2</sink_block_id>
+    <source_block_id>blocks_multiply_const_vxx</source_block_id>
+    <sink_block_id>audio_sink</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/grc/examples/simple/variable_config.grc 
b/grc/examples/simple/variable_config.grc
index 0b50b1e..0b60abc 100644
--- a/grc/examples/simple/variable_config.grc
+++ b/grc/examples/simple/variable_config.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:20:12 2012</timestamp>
+  <timestamp>Sat Jul 12 16:15:51 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(-1, 2)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -75,8 +79,12 @@
       <value>32000</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 170)</value>
+      <value>(-1, 125)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,42 +92,58 @@
     </param>
   </block>
   <block>
-    <key>variable_config</key>
+    <key>analog_sig_source_x</key>
     <param>
       <key>id</key>
-      <value>freq_init</value>
+      <value>analog_sig_source_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1000</value>
-    </param>
-    <param>
       <key>type</key>
-      <value>real</value>
+      <value>complex</value>
     </param>
     <param>
-      <key>config_file</key>
-      <value>config.conf</value>
+      <key>samp_rate</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>section</key>
-      <value>main</value>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
     </param>
     <param>
-      <key>option</key>
+      <key>freq</key>
       <value>freq</value>
     </param>
     <param>
-      <key>writeback</key>
-      <value>freq</value>
+      <key>amp</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(255, 17)</value>
+      <value>(173, 201)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -127,54 +151,50 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>blocks_throttle</key>
     <param>
       <key>id</key>
-      <value>freq</value>
+      <value>blocks_throttle_0</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>label</key>
-      <value>Frequency (Hz)</value>
-    </param>
-    <param>
-      <key>value</key>
-      <value>freq_init</value>
+      <key>type</key>
+      <value>complex</value>
     </param>
     <param>
-      <key>min</key>
-      <value>-samp_rate/2</value>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
     </param>
     <param>
-      <key>max</key>
-      <value>samp_rate/2</value>
+      <key>vlen</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>style</key>
-      <value>wx.SL_HORIZONTAL</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>converver</key>
-      <value>float_converter</value>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value></value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>notebook</key>
-      <value></value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(429, 24)</value>
+      <value>(392, 233)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -182,10 +202,10 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2_0</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -196,76 +216,224 @@
       <value>complex</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>name</key>
+      <value>QT GUI Plot</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
     </param>
     <param>
-      <key>baseband_freq</key>
+      <key>fc</key>
       <value>0</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>bw</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>y_divs</key>
+      <key>average</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>ymin</key>
+      <value>-140</value>
+    </param>
+    <param>
+      <key>ymax</key>
       <value>10</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>50</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>1024</value>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>30</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>color1</key>
+      <value>"blue"</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>alpha1</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>avg_alpha</key>
-      <value>0</value>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>alpha4</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>label5</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
       <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(671, 233)</value>
+      <value>(643, 221)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -273,30 +441,58 @@
     </param>
   </block>
   <block>
-    <key>blocks_throttle</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
-      <value>blocks_throttle_0</value>
+      <value>freq</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>complex</value>
+      <key>label</key>
+      <value>Frequency (Hz)</value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>value</key>
+      <value>1e3</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>start</key>
+      <value>-samp_rate/2</value>
+    </param>
+    <param>
+      <key>stop</key>
+      <value>samp_rate/2</value>
+    </param>
+    <param>
+      <key>step</key>
       <value>1</value>
     </param>
     <param>
+      <key>widget</key>
+      <value>counter_slider</value>
+    </param>
+    <param>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
+    </param>
+    <param>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(392, 233)</value>
+      <value>(339, 9)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -304,42 +500,46 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>variable_config</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <value>freq_init</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
+      <key>value</key>
+      <value>1000</value>
+    </param>
+    <param>
       <key>type</key>
-      <value>complex</value>
+      <value>real</value>
     </param>
     <param>
-      <key>samp_rate</key>
-      <value>samp_rate</value>
+      <key>config_file</key>
+      <value>/home/mbant/.gnuradio/config.conf</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>section</key>
+      <value>main</value>
     </param>
     <param>
-      <key>freq</key>
+      <key>option</key>
       <value>freq</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>1</value>
+      <key>writeback</key>
+      <value>freq</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>0</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(173, 201)</value>
+      <value>(168, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -347,14 +547,14 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blocks_throttle_0</source_block_id>
-    <sink_block_id>wxgui_fftsink2_0</sink_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>blocks_throttle_0</sink_block_id>
+    <source_block_id>blocks_throttle_0</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
diff --git a/grc/examples/xmlrpc/xmlrpc_client.grc 
b/grc/examples/xmlrpc/xmlrpc_client.grc
index 3bb4e7e..45d8af2 100644
--- a/grc/examples/xmlrpc/xmlrpc_client.grc
+++ b/grc/examples/xmlrpc/xmlrpc_client.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Thu Jul 24 14:27:44 2008</timestamp>
+  <timestamp>Sat Jul 12 17:10:55 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,15 +29,101 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
       <value>Custom</value>
     </param>
     <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(-2, 0)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>32000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(13, 172)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>xmlrpc_client</key>
+    <param>
+      <key>id</key>
+      <value>xmlrpc_client</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>addr</key>
+      <value>localhost</value>
+    </param>
+    <param>
+      <key>port</key>
+      <value>1234</value>
+    </param>
+    <param>
+      <key>callback</key>
+      <value>set_freq</value>
+    </param>
+    <param>
+      <key>variable</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(177, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -71,8 +157,12 @@
       <value>ampl</value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(409, 35)</value>
+      <value>(308, 0)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -83,7 +173,7 @@
     <key>xmlrpc_client</key>
     <param>
       <key>id</key>
-      <value>xmlrpc_client</value>
+      <value>xmlrpc_client1</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -99,15 +189,19 @@
     </param>
     <param>
       <key>callback</key>
-      <value>set_freq</value>
+      <value>set_offset</value>
     </param>
     <param>
       <key>variable</key>
-      <value>freq</value>
+      <value>offset*ampl</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(222, 34)</value>
+      <value>(440, 4)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -115,7 +209,7 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
       <value>freq</value>
@@ -133,28 +227,40 @@
       <value>1000</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
-      <value>5000</value>
+      <key>stop</key>
+      <value>5e3</value>
+    </param>
+    <param>
+      <key>step</key>
+      <value>1</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>slider_type</key>
-      <value>horizontal</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 1, 2</value>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>0,0,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(207, 162)</value>
+      <value>(209, 165)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -162,7 +268,7 @@
     </param>
   </block>
   <block>
-    <key>variable_slider</key>
+    <key>variable_qtgui_range</key>
     <param>
       <key>id</key>
       <value>ampl</value>
@@ -180,28 +286,40 @@
       <value>1</value>
     </param>
     <param>
-      <key>min</key>
+      <key>start</key>
       <value>0</value>
     </param>
     <param>
-      <key>max</key>
+      <key>stop</key>
       <value>2</value>
     </param>
     <param>
-      <key>num_steps</key>
-      <value>100</value>
+      <key>step</key>
+      <value>.1</value>
+    </param>
+    <param>
+      <key>widget</key>
+      <value>counter_slider</value>
     </param>
     <param>
-      <key>slider_type</key>
-      <value>horizontal</value>
+      <key>orient</key>
+      <value>Qt.Horizontal</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>1, 0, 1, 2</value>
+      <key>min_len</key>
+      <value>200</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>1,0,1,2</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(397, 167)</value>
+      <value>(367, 158)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -209,7 +327,7 @@
     </param>
   </block>
   <block>
-    <key>variable_chooser</key>
+    <key>variable_qtgui_chooser</key>
     <param>
       <key>id</key>
       <value>offset</value>
@@ -223,90 +341,88 @@
       <value>Offset</value>
     </param>
     <param>
-      <key>value_index</key>
-      <value>1</value>
+      <key>type</key>
+      <value>int</value>
     </param>
     <param>
-      <key>choices</key>
-      <value>[-1, 0, 1]</value>
+      <key>num_opts</key>
+      <value>3</value>
     </param>
     <param>
-      <key>labels</key>
-      <value>["neg", "zero", "pos"]</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>chooser_type</key>
-      <value>radio_buttons_horizontal</value>
+      <key>options</key>
+      <value>[0, 1, 2]</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 1, 2</value>
+      <key>labels</key>
+      <value>[]</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(596, 177)</value>
+      <key>option0</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_rotation</key>
+      <key>label0</key>
+      <value>neg</value>
+    </param>
+    <param>
+      <key>option1</key>
       <value>0</value>
     </param>
-  </block>
-  <block>
-    <key>xmlrpc_client</key>
     <param>
-      <key>id</key>
-      <value>xmlrpc_client1</value>
+      <key>label1</key>
+      <value>zero</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>option2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>addr</key>
-      <value>localhost</value>
+      <key>label2</key>
+      <value>pos</value>
     </param>
     <param>
-      <key>port</key>
-      <value>1234</value>
+      <key>option3</key>
+      <value>3</value>
     </param>
     <param>
-      <key>callback</key>
-      <value>set_offset</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>variable</key>
-      <value>offset*ampl</value>
+      <key>option4</key>
+      <value>4</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(608, 39)</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>widget</key>
+      <value>combo_box</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>samp_rate</value>
+      <key>orient</key>
+      <value>Qt.QVBoxLayout</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>gui_hint</key>
+      <value>2,0,1,2</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32000</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(13, 172)</value>
+      <value>(531, 145)</value>
     </param>
     <param>
       <key>_rotation</key>
       <value>0</value>
     </param>
   </block>
-</flow_graph>
\ No newline at end of file
+</flow_graph>
diff --git a/grc/examples/xmlrpc/xmlrpc_server.grc 
b/grc/examples/xmlrpc/xmlrpc_server.grc
index 3a133fd..d210b26 100644
--- a/grc/examples/xmlrpc/xmlrpc_server.grc
+++ b/grc/examples/xmlrpc/xmlrpc_server.grc
@@ -1,6 +1,6 @@
 <?xml version='1.0' encoding='ASCII'?>
 <flow_graph>
-  <timestamp>Sat Nov 10 15:20:55 2012</timestamp>
+  <timestamp>Sat Jul 12 17:11:40 2014</timestamp>
   <block>
     <key>options</key>
     <param>
@@ -29,7 +29,7 @@
     </param>
     <param>
       <key>generate_options</key>
-      <value>wx_gui</value>
+      <value>qt_gui</value>
     </param>
     <param>
       <key>category</key>
@@ -52,8 +52,12 @@
       <value></value>
     </param>
     <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(10, 10)</value>
+      <value>(0, -1)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -64,7 +68,7 @@
     <key>variable</key>
     <param>
       <key>id</key>
-      <value>offset</value>
+      <value>ampl</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -72,11 +76,42 @@
     </param>
     <param>
       <key>value</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(4, 291)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
       <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>id</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>1000</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
     <param>
       <key>_coordinate</key>
-      <value>(12, 390)</value>
+      <value>(2, 213)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -84,26 +119,26 @@
     </param>
   </block>
   <block>
-    <key>xmlrpc_server</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>xmlrpc_server</value>
+      <value>samp_rate</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>addr</key>
-      <value>localhost</value>
+      <key>value</key>
+      <value>32000</value>
     </param>
     <param>
-      <key>port</key>
-      <value>1234</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(395, 240)</value>
+      <value>(2, 136)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -111,74 +146,136 @@
     </param>
   </block>
   <block>
-    <key>wxgui_scopesink2</key>
+    <key>variable</key>
     <param>
       <key>id</key>
-      <value>wxgui_scopesink2</value>
+      <value>offset</value>
     </param>
     <param>
       <key>_enabled</key>
       <value>True</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>value</key>
+      <value>0</value>
     </param>
     <param>
-      <key>title</key>
-      <value>Scope Plot</value>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(3, 366)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>analog_sig_source_x</key>
+    <param>
+      <key>id</key>
+      <value>analog_sig_source_x_0</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>float</value>
     </param>
     <param>
       <key>samp_rate</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>v_scale</key>
+      <key>waveform</key>
+      <value>analog.GR_COS_WAVE</value>
+    </param>
+    <param>
+      <key>freq</key>
+      <value>freq</value>
+    </param>
+    <param>
+      <key>amp</key>
+      <value>ampl</value>
+    </param>
+    <param>
+      <key>offset</key>
+      <value>offset</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>v_offset</key>
+      <key>maxoutbuf</key>
       <value>0</value>
     </param>
     <param>
-      <key>t_scale</key>
-      <value>.001</value>
+      <key>_coordinate</key>
+      <value>(175, 0)</value>
     </param>
     <param>
-      <key>ac_couple</key>
-      <value>False</value>
+      <key>_rotation</key>
+      <value>0</value>
     </param>
+  </block>
+  <block>
+    <key>blocks_throttle</key>
     <param>
-      <key>xy_mode</key>
-      <value>False</value>
+      <key>id</key>
+      <value>blocks_throttle</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
     </param>
     <param>
-      <key>num_inputs</key>
+      <key>type</key>
+      <value>float</value>
+    </param>
+    <param>
+      <key>samples_per_second</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>vlen</key>
       <value>1</value>
     </param>
     <param>
-      <key>win_size</key>
-      <value></value>
+      <key>ignoretag</key>
+      <value>True</value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>0, 0, 2, 4</value>
+      <key>alias</key>
+      <value></value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>affinity</key>
       <value></value>
     </param>
     <param>
-      <key>trig_mode</key>
-      <value>wxgui.TRIG_MODE_AUTO</value>
+      <key>minoutbuf</key>
+      <value>0</value>
     </param>
     <param>
-      <key>y_axis_label</key>
-      <value>Counts</value>
+      <key>maxoutbuf</key>
+      <value>0</value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(623, 28)</value>
+      <value>(399, 35)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -186,10 +283,41 @@
     </param>
   </block>
   <block>
-    <key>wxgui_fftsink2</key>
+    <key>xmlrpc_server</key>
     <param>
       <key>id</key>
-      <value>wxgui_fftsink2</value>
+      <value>xmlrpc_server</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>addr</key>
+      <value>localhost</value>
+    </param>
+    <param>
+      <key>port</key>
+      <value>1234</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(129, 137)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+  </block>
+  <block>
+    <key>qtgui_time_sink_x</key>
+    <param>
+      <key>id</key>
+      <value>qtgui_time_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -200,176 +328,320 @@
       <value>float</value>
     </param>
     <param>
-      <key>title</key>
-      <value>FFT Plot</value>
+      <key>name</key>
+      <value>Scope Plot</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>size</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>srate</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>baseband_freq</key>
-      <value>0</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>y_per_div</key>
-      <value>10</value>
+      <key>ymin</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>y_divs</key>
-      <value>8</value>
+      <key>ymax</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_level</key>
-      <value>50</value>
+      <key>nconnections</key>
+      <value>1</value>
     </param>
     <param>
-      <key>ref_scale</key>
-      <value>2.0</value>
+      <key>update_time</key>
+      <value>0.10</value>
     </param>
     <param>
-      <key>fft_size</key>
-      <value>512</value>
+      <key>entags</key>
+      <value>True</value>
     </param>
     <param>
-      <key>fft_rate</key>
-      <value>15</value>
+      <key>gui_hint</key>
+      <value>0, 0, 2, 4</value>
     </param>
     <param>
-      <key>peak_hold</key>
-      <value>False</value>
+      <key>tr_mode</key>
+      <value>qtgui.TRIG_MODE_FREE</value>
     </param>
     <param>
-      <key>average</key>
-      <value>False</value>
+      <key>tr_slope</key>
+      <value>qtgui.TRIG_SLOPE_POS</value>
     </param>
     <param>
-      <key>avg_alpha</key>
+      <key>tr_level</key>
+      <value>0.0</value>
+    </param>
+    <param>
+      <key>tr_delay</key>
       <value>0</value>
     </param>
     <param>
-      <key>win</key>
-      <value>None</value>
+      <key>tr_chan</key>
+      <value>0</value>
     </param>
     <param>
-      <key>win_size</key>
+      <key>tr_tag</key>
+      <value>""</value>
+    </param>
+    <param>
+      <key>label1</key>
       <value></value>
     </param>
     <param>
-      <key>grid_pos</key>
-      <value>2, 0, 2, 4</value>
+      <key>width1</key>
+      <value>1</value>
     </param>
     <param>
-      <key>notebook</key>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker1</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
       <value></value>
     </param>
     <param>
-      <key>freqvar</key>
-      <value>None</value>
+      <key>width2</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(630, 233)</value>
+      <key>color2</key>
+      <value>"red"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style2</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>samp_rate</value>
+      <key>marker2</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha2</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>value</key>
-      <value>32000</value>
+      <key>label3</key>
+      <value></value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(11, 160)</value>
+      <key>width3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>color3</key>
+      <value>"green"</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>freq</value>
+      <key>style3</key>
+      <value>1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>marker3</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>value</key>
-      <value>1000</value>
+      <key>alpha3</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(11, 237)</value>
+      <key>label4</key>
+      <value></value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>width4</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>variable</key>
     <param>
-      <key>id</key>
-      <value>ampl</value>
+      <key>color4</key>
+      <value>"black"</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>style4</key>
+      <value>1</value>
     </param>
     <param>
-      <key>value</key>
+      <key>marker4</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
       <value>1</value>
     </param>
     <param>
-      <key>_coordinate</key>
-      <value>(13, 315)</value>
+      <key>color5</key>
+      <value>"cyan"</value>
     </param>
     <param>
-      <key>_rotation</key>
-      <value>0</value>
+      <key>style5</key>
+      <value>1</value>
     </param>
-  </block>
-  <block>
-    <key>blocks_throttle</key>
     <param>
-      <key>id</key>
-      <value>blocks_throttle</value>
+      <key>marker5</key>
+      <value>-1</value>
     </param>
     <param>
-      <key>_enabled</key>
-      <value>True</value>
+      <key>alpha5</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>type</key>
-      <value>float</value>
+      <key>label6</key>
+      <value></value>
     </param>
     <param>
-      <key>samples_per_second</key>
-      <value>samp_rate</value>
+      <key>width6</key>
+      <value>1</value>
     </param>
     <param>
-      <key>vlen</key>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>style6</key>
       <value>1</value>
     </param>
     <param>
+      <key>marker6</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>style7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker7</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>style8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker8</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>style9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker9</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>style10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>marker10</key>
+      <value>-1</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
       <key>_coordinate</key>
-      <value>(386, 93)</value>
+      <value>(644, 13)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -377,10 +649,10 @@
     </param>
   </block>
   <block>
-    <key>analog_sig_source_x</key>
+    <key>qtgui_freq_sink_x</key>
     <param>
       <key>id</key>
-      <value>analog_sig_source_x_0</value>
+      <value>qtgui_freq_sink_x_0</value>
     </param>
     <param>
       <key>_enabled</key>
@@ -391,28 +663,224 @@
       <value>float</value>
     </param>
     <param>
-      <key>samp_rate</key>
+      <key>name</key>
+      <value>Spectrum Plot</value>
+    </param>
+    <param>
+      <key>fftsize</key>
+      <value>1024</value>
+    </param>
+    <param>
+      <key>wintype</key>
+      <value>firdes.WIN_BLACKMAN_hARRIS</value>
+    </param>
+    <param>
+      <key>fc</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>bw</key>
       <value>samp_rate</value>
     </param>
     <param>
-      <key>waveform</key>
-      <value>analog.GR_COS_WAVE</value>
+      <key>autoscale</key>
+      <value>False</value>
     </param>
     <param>
-      <key>freq</key>
-      <value>freq</value>
+      <key>average</key>
+      <value>1.0</value>
     </param>
     <param>
-      <key>amp</key>
-      <value>ampl</value>
+      <key>ymin</key>
+      <value>-140</value>
     </param>
     <param>
-      <key>offset</key>
-      <value>offset</value>
+      <key>ymax</key>
+      <value>10</value>
+    </param>
+    <param>
+      <key>nconnections</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>update_time</key>
+      <value>0.10</value>
+    </param>
+    <param>
+      <key>gui_hint</key>
+      <value>2, 0, 2, 4</value>
+    </param>
+    <param>
+      <key>label1</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width1</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color1</key>
+      <value>"blue"</value>
+    </param>
+    <param>
+      <key>alpha1</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label2</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width2</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color2</key>
+      <value>"red"</value>
+    </param>
+    <param>
+      <key>alpha2</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label3</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width3</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color3</key>
+      <value>"green"</value>
+    </param>
+    <param>
+      <key>alpha3</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label4</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width4</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color4</key>
+      <value>"black"</value>
+    </param>
+    <param>
+      <key>alpha4</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label5</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width5</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color5</key>
+      <value>"cyan"</value>
+    </param>
+    <param>
+      <key>alpha5</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label6</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width6</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color6</key>
+      <value>"magenta"</value>
+    </param>
+    <param>
+      <key>alpha6</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label7</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width7</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color7</key>
+      <value>"yellow"</value>
+    </param>
+    <param>
+      <key>alpha7</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label8</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width8</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color8</key>
+      <value>"dark red"</value>
+    </param>
+    <param>
+      <key>alpha8</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label9</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width9</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color9</key>
+      <value>"dark green"</value>
+    </param>
+    <param>
+      <key>alpha9</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>label10</key>
+      <value></value>
+    </param>
+    <param>
+      <key>width10</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>color10</key>
+      <value>"dark blue"</value>
+    </param>
+    <param>
+      <key>alpha10</key>
+      <value>1.0</value>
+    </param>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
     </param>
     <param>
       <key>_coordinate</key>
-      <value>(164, 154)</value>
+      <value>(644, 126)</value>
     </param>
     <param>
       <key>_rotation</key>
@@ -420,20 +888,20 @@
     </param>
   </block>
   <connection>
-    <source_block_id>blocks_throttle</source_block_id>
-    <sink_block_id>wxgui_scopesink2</sink_block_id>
+    <source_block_id>analog_sig_source_x_0</source_block_id>
+    <sink_block_id>blocks_throttle</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
     <source_block_id>blocks_throttle</source_block_id>
-    <sink_block_id>wxgui_fftsink2</sink_block_id>
+    <sink_block_id>qtgui_time_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>
   <connection>
-    <source_block_id>analog_sig_source_x_0</source_block_id>
-    <sink_block_id>blocks_throttle</sink_block_id>
+    <source_block_id>blocks_throttle</source_block_id>
+    <sink_block_id>qtgui_freq_sink_x_0</sink_block_id>
     <source_key>0</source_key>
     <sink_key>0</sink_key>
   </connection>



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