PO-28 robot 99 USD ready to ship add to cart live synthesizer and sequencer, with parameter locks, glide control and punch-in effects. pocket operators are small, ultra portable music devices. each model can be used individually, together or with other compatible gear. real 8-bit synthesizer engines for making live and sequenced melodies and leads 15 sounds + micro drum live play + sequencer combo 128 pattern chaining step multiplier