Teenage Engineering OP-1 Synth Workstation & OP-1 Radio Antenna Bundle A compact 24-button (not velocity sensitive) synth you can use to make music anywhere, even where there's no AC power 8 x synthesizer engines with exchangable architecture let you create tons of unique sounds DBOX drum synthesizer provides up to 12 seconds of sampling per slot Included storage provides 6 x minutes recording time (expandable up to 24) 4-track mixer with EQ, Effect, Drive and Master Out controls