I haven’t yet been able to tap and drag or draw new note paths on the XY pad. I read the manual, and I turned off multitouch gestures in Settings, in case that was the issue. Still, I can’t get this feature to work. Everything else works, though—I can just get lost playing with this beautiful-sounding app!
In the Path control section on the right, you have to turn on Edit (light turns red). I still haven’t found a way to delete a single point yet.