Add note sequencer / piano roll

It would be nice to add a “piano roll” or “note sequencer” UI widget.

Please add a sample photo so that we can better imagine it.

@kisvegabor here are some examples:

also a step sequencer view would be nice.

I can help you out with some concepts and functional principle.

Do you mean only this part, right?

Correct. And also the “step sequencer” part, which is more useful for rhythmical things.
The Piano Roll should be scrollable in X/Y direction and optimally have an adjustable grid/snap.

Got it, thanks. Seems doable at first look. If you are interested in implementing it, please let me know, and we can discuss the details.