https://www.engadget.com/2006-11-27-nintendo-ds-doubles-as-wireless-midi-keyboard-controller.html
Nintendo DS doubles as wireless MIDI keyboard / controller
Nov 27, 2006 - Joining the nearly endless amount of Nintendo DS hacks already in the wild is TobW's DS Sampling Keyboard, which "uses the DS's microphone and touchscreen" to...
wireless midi keyboardnintendo dsdoublescontroller