Today, my friend Edvard came to my house to play with Arduino. He ordered some flex resistors from the U.S. When you bend them, the resistance value changes, which makes it great for controlling Max/MSP. So we hooked up the Arduino board to Max/MSP and ran the FM Synth patch from an MSP tutorial.
The index finger controls the carrier frequency, the middle finger controls the harmonicity, the pot controls the length and the button triggers the synth. The sound itself isn’t too fancy, but this project was more for fun than anything of sonic value.