[linux-audio-user] Linux Vocoder (?)

Johan Mattsson mayouan at isonews2.com
Sun Jul 23 19:24:41 EDT 2006

DCZX wrote:
>> Does anyone know of a good vocoder app or plugin?
Pieter Palmers wrote:
> http://www.sirlab.de/linux/download_vocoder.html 

This is a nice program, but there is some problems with it, the stand 
alone application does not have support for JACK. It is desirable since 
JACK makes it a lot easier to plug a soft synths as formant. The LADSPA 
plugin could do this with inserted to a program (e.g AMS) but I wanted a 
more flexible approach so I thought it was a good idea using it with 
JACK-RACK. This is not possible because JACK-RACK assumes that every 
plugin has equally many input as output ports.

I changed the LADSPA-plugin so it registers two outputports and therfore 
works with JACK-RACK.  Further more have I added some LADSPA_HINTS that 
suggests appropriate default values, however JACK-RACK seems not to be 
able to handle the controls in a proper way, but as far as I understand 
is my changes valid according to LADSPA specifications and the problem 
is in jack-rack.

I guess it could be done with ecasound too, but i never got the 
parameters right.

Here is the a patch for this, I admit it is not a very nice way of 
solving the problem but it works.


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