[LAU] Running the guitarix LADSPA plugins on a headless system

[Sean Bolton]

Hi Jeremy,

On Fri Feb 15 2013, Jeremy Jongepier wrote:
> I'm trying to figure out what is the best way to use the Guitarix-Amp 
> and Guitarix-FX LADSPA plugins on a headless system (read Raspberry
> Pi). I've tried it with Ecasound but it already consumes more CPU
> than the guitarix application itself! So I'm obviously doing
> something wrong. Maybe this is because the Guitarix-Amp plugin has
> one input and two outputs, read something about Ecasound starting up
> multiple instances of the plugin in such a case which is not what I
> want. So any hints or tips on getting this to run smoothly? I can use
> either JACK or ALSA directly. I prefer using JACK, somehow using bare
> ALSA produces large amounts of xruns.

How about jack-dssi-host?

$ DSSI_PATH=/usr/lib/ladspa jack-dssi-host guitarix_amp.so

jack-dssi-host will then print out (among other things) its OSC path. Use this path with dssi_osc_send to set the plugin parameters (append '/control' to the path):

$ dssi_osc_send osc.udp://youraddresshere.com:13160/dssi/guitarix_amp/guitarix_amp/chan00/control 5 -20

which sets control port 5 to -20. You can query the current state of the plugin:

$ dssi_osc_update osc.udp://youraddresshere.com:13160/dssi/guitarix_amp/guitarix_amp/chan00

and don't forget analyseplugin to get the port numbers. HTH,

-Sean