On Wed, Nov 18, 2015 at 11:56 AM, jonetsu@teksavvy.com <jonetsu@teksavvy.com> wrote:
The question is now, how to share MIDI between the applications (let
alone which MIDI channel controls what) ?

The issues seems like it could be related to this: http://answers.bitwig.com/questions/371/solved-midi-io-on-linux

Have you tried any of the solutions on that thread?