Bellows Accordion

Bellows Accordion turns a foldable iPhone into a squeezebox. Hold the open phone like a handheld game console with a thumb on each pane: the left pane has bass and chord buttons, the right pane has melody keys, and the hinge between them is the bellows. Opening and closing the phone fills the bellows with air, and the air drives the loudness and brightness of the reeds. Small, slow movements are enough: the bellows keep a little air in reserve, so a gentle stroke sustains a phrase and changing direction does not drop the sound. Hold the phone still and the sound fades, the way a real instrument does when the player stops. The first time you open the phone, the bellows breathe a chord and a short note shows you how to play. If you press keys without moving the bellows, the gauge pulses to remind you to pump. Everything is sized for thumbs. The melody keys run down the right pane like the…