Expremigen: Expressive MIDI Generation Library (github.com)

I’ve been working on an IDE for music composition. Launching soon https://ngrid.io

Nice. The concept reminds me of Karya, which has a similar (?) structure of arbitrarily complicated nested expressions per note.

https://ofb.net/~elaforge/karya/doc/overview.md.html

This looks really cool, will have to dig in more later.

IMO there is no solution that is so much better than MIDI CC to give up the backward compatibility and universality of MIDI.