KeyStep 37 mk2 is the ultimate compact controller & sequencer for hybrid setups. With a 37-note Slimkey keyboard, hands-on encoders, generative sequencing tools, and deep connectivity via CV/Gate, MIDI DIN, and USB-C — spark ideas in your DAW, pilot any synth, or patch modular without breaking your flow.

Step into
your next idea KeyStep 37 mk2 is more than keys. It’s a sequencer, arpeggiator, and musical nerve-centre that bridges hardware and software so you can compose, jam, and perform anywhere your ideas take you. Hands-on control

Play, arpeggiate, and sequence ideas the moment they strike. KeyStep 37’s OLED display, 4 mode-aware encoders, and full RGB feedback also make every edit fast and intuitive.

Generative creativity

Capture a riff, turn it into a sequence, then transform it with mutation tools and real-time performance control. Keep inspiration flowing with features that invite constant discovery and movement.

Universal connectivity

Command modular, vintage, and modern gear alongside your DAW. Controllable CV/Gate, MIDI DIN, Sync I/O, and USB-C keep every piece of your setup talking, and in time.

Control & sequence
anything

From sketching a melody to shaping full arrangements, KeyStep 37 mk2 keeps ideas on the move. Every touch, twist, and note responds instantly, letting you build, evolve, and perform without interruption.

Slimkey keybed: 37 expressive keys with velocity & aftertouch.

16 mode arpeggiator: From simple cycles to creative melodic textures.

Pitch & mod touch strips: Smooth bends and modulation plus live Gate/Spice/Dice sliders.

4 mode-aware encoders: Instant access to Seq/Arp/Chord/Mutate editing.

Mutate, Spice & Dice: Instant, musical variations and controlled randomness.

Controllable CV/Gate outputs: Four outputs for pitch, gate, and modulation — with flexible mapping.

Polyphonic step sequencer: Record or program up to 64 steps of 8-note polyphony.

Chord & Scale modes: Lock to a key and trigger full chords for harmonic flow.

Full-size MIDI DIN + Sync I/O: Seamless DAW, hardware, and Eurorack integration.

Inspiration
on command

From first riff to full pattern, KeyStep 37 mk2 is designed for hands-on evolution. Trigger sequences, tweak arp behavior, and dial in performance changes with immediate controls. Overdub, record automation, and transform an idea in seconds, without breaking tempo.

More keys
deeper control KeyStep 37 mk2 expands the mk2 workflow with extra playing range, dedicated hands-on controls, and performance-ready shortcuts — letting you tweak all the details in real time. More keys, clearer feedback

Five extra keys give you more range for two-hand parts and wider chord shapes. LEDs above the keys keep you oriented at a glance — sequence progress, banks, patterns, and scale context.

Mode-aware encoders

A dedicated Control button and 4 encoders put core edits under your fingers while playing. Switch between Seq, Arp, Chord, and Mutate, and the encoders automatically remap to the parameters that matter in the moment.

Deeper MIDI + CV control

Tap MIDI CC for 16 assignable controls across 4 banks, mapped to the encoders and available across modes. Plus, controllable CVMOD outputs let you adapt modulation type and range to your modular gear fast.

3 modes
working as one KeyStep 37 mk2’s modes work in synergy to keep ideas evolving - capture a riff, turn it into a sequence, mutate it, and keep the momentum alive. Sequencer mode

Create and play back polyphonic patterns. Chain, overdub, undo, mutate, automate bends/mod, and transform sequences live - great for hardware rigs and sketching ideas in your DAW.

Arpeggiator mode

Choose from 16 arp types including Poly, Walk, Pattern, and Random. Phrase Arp remaps your sequence to played notes for immediate, musical mutations.

Controller mode

With MIDI, USB, and CV, KeyStep 37 mk2 handles it all. Use it as a central controller to sequence gear, input chords, or modulate CV synths from one compact keyboard.

Every port
every possibility

KeyStep 37 mk2 is your universal creative interface. Patch into modular systems, control synths from past and present, and synchronize your drum machines. Ready to command any setup - live, in the studio, or on the move.

Digital & analog, unified

Full-size MIDI DIN I/O for classic hardware, USB-C for DAWs and soft-synths, and assignable CV/Gate for modular.

CV for modular minds

Four CV/Gate outs mappable to velocity, aftertouch, mod-wheel, and more. Patch lines, open filters, ping envelopes: expressive control.

Sync, sustain & convert

3.5 mm Sync In/Out for vintage gear, TRS sustain/expression input for feel, plus MIDI In → CV to play modular from external keys.

A closer
look Explore the controls, layout, and creative features of KeyStep 37 mk2 in detail, from its premium keybed to performance features. 37-note Slimkey keyboard

Arturia-designed keybed with velocity & aftertouch.

OLED display + push-encoder

Clear screen with data knob and Back button for instant setup.

Pattern chaining & Seq/Arp

Build full songs or transform sequences into arpeggios on the fly.

4 encoders + Control button

Mode-aware knobs for fast Seq/Arp/Chord/Mutate editing without menu-diving.

Mutate button

One-touch melodic mutation — with dedicated knob control for deeper generative shaping.

MIDI CC button + CC banks

16 assignable CCs across 4 banks, mapped to the encoders for hands-on gear control.

Chord & Scale modes

Record chords or lock to scales for effortless in-key playing (plus SHIFT shortcut for scale selection).

LEDs above keys

Instant visual feedback for sequence progress, banks, patterns, and scale context.

Transport + Tap

Real-time, step, or un-quantized recording; add rests & ties with ease.

Performance strips & live sliders

Capacitive Pitch & Mod strips, plus Gate Length and Spice/Dice sliders for expressive tweaks.

Shift + Octave -/+

Access secondary functions and transpose the keyboard up or down quickly.

Controllable CV/GATE outputs

Pitch, Gate, Mod 1, Mod 2 — assignable to velocity, aftertouch, mod wheel, and more, with flexible response for modular gear.

Sustain / Expression jack

Connect a sustain pedal, footswitch, or expression control.

Sync I/O

3.5 mm clock in/out for sending or receiving sync with start/stop messages.

MIDI DIN In/Out

Full-size 5-pin MIDI ports to connect with any DAW or hardware MIDI gear.

USB-C

Class-compliant bus power and USB MIDI connection.

Power switch

Sturdy on/off hardware control.

Find
your fit Prefer a wider keybed and deeper real-time control?

KeyStep 37 mk2 adds five extra keys, mode-aware encoders, and expanded performance tools — built for players who want to push sequences, arps, and modular gear further.

Main Features

37‑note Slimkey keyboard with velocity & aftertouch

2 capacitive touch strips for pitch‑bend & modulation

Polyphonic step sequencer: up to 64 steps, 8‑voice polyphony

16‑mode arpeggiator with generative pattern styles

Mutate, Spice & Dice tools for live variation

Chord & Scale modes for instant harmony

OLED display with clickable encoder & RGB LED feedback

4 encoders + Control button. Hands-on, mode-aware editing for Seq, Arp, Chord, and Mutate

MIDI CC button with 4 banks. Access 16 assignable MIDI CCs available across all modes

4 controllable CV/Gate outputs (Pitch, Gate, Mod 1, Mod 2) assignable to velocity, aftertouch, mod wheel & more

Full‑size MIDI DIN In/Out + 3.5 mm Sync In/Out

MIDI Thru support

Sustain / expression pedal input (TRS)

USB‑C MIDI (class‑compliant) and bus power

Power switch & Kensington lock slot

Low‑power operation; iPad® compatible (camera connection kit required)

Software bundle:

• Analog Lab Intro (500+ sounds)

• Ableton Live Lite

What’s in the box

Box content

• KeyStep 37 mk2 unit

• USB-A to USB-C cable

Size & weight

• Size (mm): 58 x 547 x 148 mm

• Size (in): 2.28 x 21.54 x 5.83 in

• Weight (kg): 1.09 kg

• Weight (lb): 2.40 lb