Auug Motion Synth
Turn your iPhone or iPod Touch into a fully-functioning instrument with the Auug Motion Synth ($70) — a combination grip for your device, eight-button synthesizer app, and a cloud-based service for sharing synth presets. These combine to form a highly-capable synth instrument that lets you easily control music using the app's keys, and the motion of your hand, changing pitch and tone as you move. Use each of the buttons to play notes, control external synth hardware, even apply effects to your vocals. The grip lets you comfortably hold your phone, while interacting with the buttons, so you can play naturally, moving freely around the stage or studio.