I had fun playing with this on my phone this morning. I had a good time cycling through all the “moods” and finding the sweet spots. Good color choices.
Maybe this has to do with the fact that I was playing it on my phone, but I think this would lend itself really as a continuous interface. Instead of pointing at regions and triggering events, you’d have all 7 voices continuously on, and the location of the pointer would determine which voices are heard at any point. Moving the point would smoothly transition/interpolate between states.
Outlining polychords and other complex chord voicings and clusters might yield some interesting results. Also, assigning a different instrument sound per voice could be cool too, and would give it more of an ensemble sound.