[fluid-dev] The missing filter

[Peter Billam]

Greetings.

On reading
 https://schristiancollins.wordpress.com/2016/03/02/using-soundfonts-in-2016
I noticed that fluidsynth gets full marks for its cc71,cc74 filter
implementation.  That's good news, but it was a big surprise for me,
because I've never experienced the fluidsynth filter to have any
effect at all. The only controllers which seem to be implemented
are the low-cpu amplitude-related things like volume and pan,
plus also the (configurable) chorus and reverb.

And yet Christian Collins reports quite the opposite, and indeed
looking in the source I do see in src/synth/fluid_voice.c
  case GEN_FILTERFC:
  ...
  case GEN_FILTERQ:
  ...
which don't seem qualified by any ifdefs and certainly make it
look like the filter should be implemented.  I don't see any option
to turn the filter on or off ...  I've previously discussed
fluidsynth on comp.music.midi (while that still had any traffic)
and others confirmed my experience that filter does not function,
let alone other controllers like portamento...

fluidsynth is still my favourite synth for real-time use because of
its low latency, though the choice of working controllers is small.
I'm on debian stable and am running fluidsynth version 1.1.6
It it a debian-package special build, built for lowest latency ?
Why doesn't my fluidsynth do filtering ?

Thanks,  Regards,  Peter Billam

http://www.pjb.com.au      address@hidden     (03) 6278 9410
"Follow the charge, not the particle."  --  Richard Feynman
 from The Theory of Positrons, Physical Review, 1949