I’ve been asked to do something about an old Rolls MP80 midi switcher. The idea is to send midi note off/on to trigger samples into Ableton (which allows midi assignations).
It appears that everything was done with digital logic (no microcontrollers).
The fact that the board can be removed made the design of a new pcb doable and cheap. The new PCB is smaller and with less components. The new board will microcontroller powered, it’ll be easier to modify the code and reprogram the thing to do many other midi related thing with it.