Can be made digitally by using a stepper motor wired as generator with a hand crank, then picking up the spikes which are proportional to the rotation speed and

Can be made digitally by using a stepper motor wired as generator with a hand crank, then picking up the spikes which are proportional to the rotation speed and feed them to a ucontroller with some sound samples in memory arranged ad a rhythm, then play them according with the detected speed. A simpler one could use the uC only to output MIDI clock data, then a start when the player starts cranking or reaches a certain minimum speed, and a stop when it stops or slows below a given lower limit.