Here's a quick way to map the Sound activation control:
- Play the multigrid
- Bring up the Grid controls VCS (by clicking the grid-of-green-squares icon at the upper right side of the multigrid frame)
- In the VCS, you'll see selection radio buttons lablled Select Trk_1, etc
- To select Sounds using MIDI program change numbers:
- Ctrl+Click (rightClick) on the selector you' like to map to external control
- Select Controller>MIDI>0-based program change
To use an OSC message to select which Sound is active in a track, Ctrl+Click on the Select label associated with that track and choose Learn.