[fluid-dev] LADSPA: Ports and nodes?

[Ebrahim Mayat]

Hi

This may be a trivial question to many of you but how does one load and 
activate a ladspa plugin? Loading seems to work but I get an error 
message each time I try to start with "ladspa_start".

> > set synth.ladspa-active on				//this is just a comment only added in 
> this message for clarity
>
> > ladspa_add delay.so delay_5s 3 .5		//to apply 3 seconds of delay 
> with a 50% wet signal
> > ladspa_start
> 1 audio groups
> ***Error012***
> Leftover tokens: 3 .5 ...
>
> > ladspa_add delay.so delay_5s 3 .5 fluidsynth coreaudio	//with 
> fluidsynth input and coreaudio output
> > ladspa_start
> 1 audio groups
> ***Error017***
> Unable to find port '3' on plugin delay_5s
> Port names are:
> - `Delay (Seconds)'
> - `Dry/Wet Balance'
> - `Input'
> - `Output'
>
> > ladspa_add delay.so delay_5s 3 .5 1 2			//Are the input and output 
> ports defined numerically?
> > ladspa_start
> 1 audio groups
> ***Error017***
> Unable to find port '3' on plugin delay_5s
> Port names are:
> - `Delay (Seconds)'
> - `Dry/Wet Balance'
> - `Input'
> - `Output'
>
> > ladspa_add delay.so delay_5s 3 .5
> > applyplugin 							//the LADSPA_PATH environment variable was 
> defined before starting fluidsynth
> unknown command: applyplugin (try help)
> > /sw/bin/applyplugin					//Added the full path of the "applyplugin" 
> binary which was not recognized
> unknown command: /sw/bin/applyplugin (try help)

How does one specify the 'Input' and 'Output' ports?

> ladspa_clear               Resets LADSPA effect unit to bypass state
> ladspa_add lib plugin n1 <- p1 n2 -> p2 ... Loads and connects LADSPA 
> plugin
> ladspa_start               Starts LADSPA effect unit
> ladspa_declnode node value Declares control node `node' with value 
> `value'
> ladspa_setnode node value  Assigns `value' to `node'

If "Delay", "Dry/Wet Balance", "input" and "Output" are ports what is a 
node? How does one assign values to nodes?

TIA.
Ebrahim