Yeah there is a Notes Setup mode, it has its own button and page and everything just like you describe
Two things I’ve noticed with it, one is you must press Yes to finalise your notes selection, don’t know if this is neccesary
And two, might be wrong here, but doesn’t feel like I can re-enter note setup and edit a note/chord for a particular trig, seems I must remove the trig and start from scratch
I do wish whatever the last note you pressed in general would be remembered so u could input that in grid record.
Like your jamming along find a note, say a baseline, and you find the note you want, would be great to then jump in grid record and drop a trig for it, but it doesn’t work that way, it always inputs the root