Korg DS-10 Synthesizer (U)(Goomba) ROM

This is not a game per se, but a tool to play with some musical concepts. It turns your DS into a simple synthesizer capable of doing some simple subtractive synthesis, starting with square, triangular or saw waves; as well as noise.
It includes a note sequencer, a drum sequencer, an onscreen keyboard, an effect controller that uses the touchpad called Kaoss and, of course, lot's of menus resmbling the buttons of older synthesizers that you can use to patch the waves and configure yout sound.
Overall it's a pretty impressive little tool, nice to play with some synthesizer concepts. Try plugging some speakers to your DS to better appreciate your music!