MIDI controller keyboard with 37 slim velocity-sensitive keys, with aftertouch and LED for visual feedback. 4-track sequencer with 16 step buttons, up to 64 steps per sequence and 16 notes of polyphony per step, with real-time recording or step recording and editing. Pitch, speed, gate length, time change and probability per note. Scale quantification with user scales. Polyphonic CV outputs. Performance-oriented 24-part polyrhythm drum sequencer with pattern randomization, quantized/unquantized recording, and loops. Arpeggiator with 7 modes, 5 octave range. Chord mode. Controller mode: 5 encoders to send DC and automate them. Sharp OLED display. 4 outputs (CV, Gate, Mod) + 8 rhythm part gate outputs. MIDI in, 2 MIDI out, USB, clock synchronization. Metronome with included speaker and line output.