CREATE MUSIC ON-THE-FLY - The Teenage Engineering OP-1 features 13 unique synth engines, 7 high-quality stereo effects, and exchangeable LFOs. It offers physically modeled string synthesis and frequency modulation. OFFERS "TAPE RECORDING" - The 4-track tape feature lets you record any beats you create, play, sequence, or tweak. You can overdub with pitch change by matching the tape-speed with the sequencer clock. PROVIDES UNIQUE SEQUENCERS - Easily arrange notes in different ways using one of the four original sequencers. While the Tape function produces pure audio recording, the sequencer stores note data SAMPLES SOUNDS FROM DIFFERENT SOURCES - You can sample a sound using the onboard microphone. The built-in FM radio allows you to sample local radio stations or music. You can also feed tracks plugged from a recorder in the 3. 5mm line input. LASTS LONGER THAN OTHER DEVICES - The tiny OP-1 packs 16 hours of battery life. You can travel and play the synthesizer without worrying about running out of power. The OP-1 can even last for 2 years on standby mode.