Arturia KeyStep Pro 37-Key Multitrack Keyboard Controller and Sequencer

Arturia KeyStep Pro: A Four-Track Sequencing Command Center for Hardware Studios

The Arturia KeyStep Pro is a 37-key controller and four-track polyphonic step sequencer built to conduct an entire studio of synths and drum machines. It layers a velocity- and aftertouch-sensitive keybed with per-key LEDs, four sequencer tracks, a 24-part drum sequencer, and a wall of CV, gate, and MIDI connections into one deck. Whether it drives modular racks, vintage analog synths, or a DAW, it is engineered to be the brain that keeps a complex hybrid rig playing in perfect time. For the producer whose studio has outgrown a single sequencer, it is the centerpiece that finally ties everything together.

Thirty-Seven Slim Keys With Aftertouch and Per-Key LEDs

The KeyStep Pro plays from 37 slim keys with velocity, aftertouch, and a bright LED above every key. Velocity and aftertouch capture how hard and how firmly you play for dynamic, expressive input, while the per-key LEDs light up to show which notes belong to the active sequence or track. That visual feedback makes it easy to read patterns across four tracks at a glance, even in a dark room. Performers and composers use the LEDs to keep their bearings while juggling several sequenced instruments at once.

A Four-Track Polyphonic Step Sequencer

At its core are four independent polyphonic step sequencers, each holding up to 64 steps. Independent tracks mean four separate instruments can run their own patterns, lengths, and rhythms simultaneously, and polyphony lets every step carry a full chord instead of a single note. This is what turns the KeyStep Pro from a keyboard into an arrangement machine, sequencing bass, chords, lead, and more at the same time. A solo artist can build and perform a complete multi-instrument piece entirely from this one surface.

A Polyrhythmic 24-Part Drum Sequencer

A dedicated 24-part drum sequencer adds polyrhythmic beat programming alongside the four melodic tracks. Twenty-four drum lanes give room for a full kit and layered percussion, and polyrhythm means each lane can run a different step length, creating grooves that shift and interlock over time. This is the same technique behind hypnotic techno and intricate electronic percussion, now available without a computer. Beatmakers use it to program evolving rhythms that feel alive rather than looped.

A Multi-Mode Arpeggiator, Chord, and Controller Modes

Seven arpeggiator modes, a chord mode, and a controller mode expand how the KeyStep Pro generates and sends music. The arpeggiator spreads held chords into rhythmic patterns across a five-octave range, chord mode voices full chords from single keys, and controller mode turns the unit into a standard MIDI keyboard for your DAW. These tools cover everything from quick inspiration to precise performance control. Producers move fluidly between sketching ideas, sequencing hardware, and playing software instruments without changing devices.

Four CV/Gate/Mod Outputs and Eight Drum Gate Outputs

The KeyStep Pro carries four CV/Gate/Mod outputs plus eight dedicated drum gate outputs for deep control of analog and modular gear. The CV outputs send pitch and modulation as control voltages using the 1V/octave standard, while gate outputs send on/off triggers, together speaking the native language of voltage-controlled synths. Eight drum gates can fire eight separate analog or modular percussion voices at once. This connectivity is what lets one controller conduct a room full of hardware that predates or sidesteps MIDI entirely.

MIDI, Clock, and Sync Connections for the Whole Studio

Comprehensive MIDI and sync connections include a MIDI input, two MIDI outputs, clock and metronome outputs, and a sustain pedal input. Two MIDI outs let the sequencer address multiple MIDI instruments independently, while clock and metronome outputs keep external drum machines, sequencers, and modular clocks locked to a shared tempo. This makes the KeyStep Pro the master timekeeper for a mixed rig of modern and vintage gear. Studios built around several synchronized instruments rely on exactly this kind of central clock and routing hub.

OLED Displays, LED Controls, and Who It Is For

Crisp OLED displays and LED-illuminated controls make deep multitrack sequencing readable and hands-on, and the unit runs from its included power supply. The screens and lit controls show track, pattern, and parameter states clearly so you can manage four sequencers plus drums without losing your place. This depth suits experienced producers and live performers running elaborate hardware setups, while its immediate, screen-guided workflow still welcomes players growing into hardware sequencing. For anyone whose modular or synth collection has become an ensemble, the KeyStep Pro is the conductor that brings it all under one set of hands.