MIDI-Jammer turns your DS into a wireless MIDI Controller. It lets you “draw” musical ideas and shapes in a manner that is both easy to pickup for a non-musician and also consistent/coherent enough that those who are trained musicians can have a high-degree of MIDI control through the interface.
Discussion and release thread: http://forum.gbadev.org/viewtopic.php?t=15173
AEP-Emu (DE/EN)
DMG Page (DE)
Indie Retro News (EN)
Retroguru (EN)