MCS-51, while being an old uC family, seems to be still in use in lots of MIDI gear even today. I’ve also noticed PIC uC’s rise to popularity in the MIDI field as well (I have done MIDI projects with both). Interestingly enough, I’ve only seen 1 MIDI device that used a Zilog Z80 (the ADA MP1).
Well excuse me. I so wasn’t aware of that since I’m new here. Honestly I work with both which is why I figured I’d see what everyone else likes to use.