The OP-Z sequencer is insanely powerful, but is it worth it? - 9to5Mac
Teenage Engineering OP-Z - Other Gear - Elektronauts
Best portable controller for OP-Z (not keyboard) - OP-Z - OP Forums
Amazon.com: teenage engineering OP-Z portable synthesizer and multimedia sequencer with wireless bluetooth connection - compatible with unity game engine, mac, ios, and android devices : Musical Instruments