Anything Honest has released Amos, a reactive MIDI instrument for iPad.
Amos is a reactive MIDI instrument. It sends MIDI notes over a wireless network to almost any desktop host app such as Garage Band, Logic, Pro Tools, Live, etc. Think MIDI wind-chimes crossed with a pinball machine.
In Amos’s physics-simulated room, collisions between objects trigger MIDI notes. Up to three duration discs (half note, quarter note, eighth note) can be grabbed and thrown around the room. There are three 6-octave keyboards that can be configured via the Settings menu. When a disc strikes a keyboard key, it takes on that key‘s note value and emits that value for each collision until a new key is struck. Tilting the device controls the gravity in the room.
Amos is available to purchase from the iTunes App Store for $2.99 USD.