Oh, I have to promote my friend Noah's human powered electronic instrument, the "Electric Eel". It's no so easy to have sufficient loudness with even with electronics:
It uses re-purposed printer carriage with stepper motor to generate electricity. With very low latency, the pulse of power boots a synthesizer and powers the audio amp.
https://www.youtube.com/watch?v=I8MUgwiZULw
It uses re-purposed printer carriage with stepper motor to generate electricity. With very low latency, the pulse of power boots a synthesizer and powers the audio amp.