I spent the weekend hacking tape players, and fooling around with electronic components. Here’s a cool xravistan that adds tremolo functionality to a cassette player. The LED shows the pulse.
I randomly recorded myself playing drums, and then listened back. There’s a break in the loop (not sure why) and then I played along with it. It’s difficult, in a way, because unless you sync to the length of the tape, you can end up with a glitchy section in the loop. This one kind of works.