Reader Otem Rellik has converted a Nintendo DS into a tiny portable touch synth called, Teensy. This way he gets a nice touch screen to play on, with the added benefit of knobs! He's even 3D Printed a case for the thing.
Wanted to share my latest Teensy synth. Uses Nintendo DS touch screens, Teensy 3.2, Teensy Audio Adapter and some Neopixels.
Learn about Teensy audio library: