Looks like the magic word is "digitize", and yes, it's a thing - see e. g. https://ccrma.stanford.edu/~kittyshi/pianoroll/pianoroll.html https://ccrma.stanford.

Looks like the magic word is "digitize", and yes, it's a thing - see e. g. https://ccrma.stanford.edu/~kittyshi/pianoroll/pianoroll.html https://ccrma.stanford.edu/~kittyshi/pianoroll/pianoroll.htm...