I put out every thing you need to rebuild this project. There is still a couple of things I want to do, but for now, Im gonna set it aside and test it out.

Further Work:

- Make a PCB that is small enough to fit into the cassette player

- Have the RP2040 save the tuning

- Implement more midi commands (pitch bend, reverse direction...)

- Get rid of the PWM square wave

- Use other channels

- Release source code