OTOONE (synthesizer)

Otoone is a musical instrument (synthesizer), with free and innovative interface. It is completely no charge, no access to the internet. Simple operation, Quick response, Multi Touch, Reverb, Volume Control(Use AcceleroMeter). For fun, for education. (how to use). Left to Right: C, C#, D, D#, E, F. Down to Up: Octave Change.