ARPIO is a new musical instrument designed to play arpeggios*. Move up-and-down the matrix to set the pattern’s speed, or left-and-right to set its pitch. Tilt the device to control volume and pitchbend, or shake for vibrato.
A similar version of ARPIO is available on iOS devices, under the name Arpeggionome (http://arpeggionomepro.com)
*An arpeggio is a musical technique where notes in a chord are played in sequence, rather than ringing out simultaneously.