Comment by epiccoleman

Dude, this is so cool! I've had something like this floating around my cluttered headspace for ages, and it always sort of floats to the surface during the rare times when I do some light sysadmin work via Termux on my phone.

Another thing that jumps to mind is the minichord[1], a nominally open-source synth/instrument.

I just love seeing these little devices people can come up with given the proliferation of the necessary devboards and tools. Nice project.