This is the Acidlab Bassline 3 analog bass synthesizer. It's a model from Acidlab, known for its Roland TB-303 clones, and is perfect for creating acid bass sounds. The unit, AC adapter, and manual (including Japanese) are included. Operation has been confirmed, and the knobs and switches respond well. It is a used item, so there are some minor signs of use, but there are no operational issues. Features • Faithfully reproduces the sound of the Roland TB-303 • Smooth filter sound thanks to the analog circuit • Built-in sequencer (supports pattern and track writing) • MIDI input/output, CV/Gate output support