This is really cool! The last level was a bit tricky. The UI looked nice and was responsive.
I did find the later levels a little confusing; the “Manual Impulse” node especially didn’t really make sense to me. It did indeed create a 1-beat offset if I attached it before attaching the main beat signal, but that didn’t logically connect in my head. In general, while the heavy constraints of this system do make for some challenging puzzles, they also make the system as a whole a lot less flexible - so, I think I would get quickly frustrated trying to make a drum beat with this outside of the context of a puzzle. I suppose it depends what your goal is making the game, though. Good job overall!