ARPIO is a new musical instrument designed to play arpeggios. Move up-and-down the matrix to set the arpeggio's speed, or left-and-right to set its pitch. Tilt the device for accelerometer-controlled volume and pitchbend, or shake for vibrato. You may be interested in ARPIO if you play piano, guitar, violin, drums, synthesizer, arpeggiators, cello, or bass.