I've gotten MIDI to work with JACK-RACK with no problems.  I just hook up my MIDI controller and use something like gmidimonitor to check the MIDI controller number for each of my sliders and knobs.  Then, all you have to do is bind the effect parameter (in JACK-RACK just right click on the parameter you want to bind) that you want to control via MIDI to the controller number that corresponds to the hardware controller you're trying to use.
That's it.  Nothing to it.

As for the second question, I'm not sure if you can use OSC with standard MIDI hardware. 


On Feb 15, 2008 5:09 PM, Benoit Rouits <brouits@free.fr> wrote:
hello
Being fed up with controlling LADSPA plugins with the mouse
(i have only 2 arms on the piano already..) I wondered if
i could buy at least one midi pedal an control one of the parameter
of a ladspa plugin (inserted in jack-rack or OM f.i.) with it.

I heard OM is controllable with OSC but i know nothing of it.

have one of you any experience/links ont that topic ?
- thanks in advance.



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