Thank you for nice comment, it was fun to do.
Now that sounds really cool, wish you luck with it. Would like to assist, I have a few hours spare a week.
Currently trying to get UE’s audio capture to produce visuals, lol, sound and vision, good old bowie.
Getting a makeshift midi keyboard in UE is fine, though it’d appear small on the android screen, all depends how many octaves you’d need. Though would be simple input flow, unless you want to design your own UI c/w buttons/sliders, etc.
Would be good to chat about it anyway.