- The KeyStep 37 mk2 is a compact controller-sequencer with 37 velocity- and aftertouch-sensitive Slimkey keys.
- Its polyphonic sequencer (64 steps, 8 voices) and 16-mode arpeggiator turn every idea into a performance.
- Mutate, Spice, and Dice tools generate musical variations in real time.
- Its complete hybrid connectivity (USB-C MIDI, MIDI DIN, 4 CV/Gate outputs) controls both a DAW and a modular system.
We’ve received quite a few MIDI controllers at Woodbrass over the past few years, and the same question comes up every time: is this one really going to change my workflow? With the Arturia KeyStep 37 mk2, the answer is clear.
Arturia takes the formula that made the original KeyStep a success and pushes the concept much further: a polyphonic sequencer, generative tools, and total hybrid connectivity. This is no longer just a MIDI keyboard. It’s a true control hub for hybrid setups, designed for producers who move between DAWs and hardware. Let’s take a closer look.
Arturia’s KeyStep 37 mk2 is a compact controller-sequencer that puts creativity at the heart of your setup. Its 37 Slimkey keys with velocity and aftertouch deliver expressive playing in a portable format.
Its polyphonic step sequencer (64 steps, 8 voices) and 16-mode arpeggiator turn even the simplest chord into an evolving pattern. The Mutate, Spice, and Dice tools generate instant variations to help you break away from predictable loops.
When it comes to connectivity, it has everything you need: class-compliant USB-C MIDI, MIDI DIN, 4 configurable CV/Gate outputs, and a pedal input. From your DAW to a modular system, the KeyStep 37 mk2 controls everything without compromise.
Specifications — Arturia KeyStep 37 mk2
| Type | MIDI / CV controller-sequencer |
|---|---|
| Keyboard | 37 Slimkey keys · Velocity · Aftertouch |
| Controls | 2 capacitive touch strips (pitch bend / modulation) · 4 encoders · Clickable encoder · OLED display · RGB LEDs |
| Sequencer | Polyphonic step sequencer · Up to 64 steps · 8 voices · Pattern chaining |
| Arpeggiator | 16 modes with generative pattern styles |
| Creative tools | Mutate Spice Dice Chords Scale |
| MIDI | Class-compliant USB-C DIN In/Out |
| CV/Gate | 4 configurable outputs: Pitch, Gate, Mod 1, Mod 2 · Assignable (velocity, aftertouch, modulation…) |
| Synchronization | 3.5 mm Sync Input/Output |
| MIDI CC control | MIDI CC button · 4 banks · 16 assignable CCs in all modes |
| Pedal | Sustain / expression input (TRS) |
| Compatibility | Mac · PC · iPad (camera connection kit required) |
| Included | KeyStep 37 mk2 · USB-A to USB-C cable |
| Verdict |
Strengths
Keep in mind
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A compact keyboard built for expression
The KeyStep 37 mk2 uses Arturia’s proven Slimkey format. Its 37 compact keys feature velocity and aftertouch, allowing you to shape your attack and add vibrato, filter opening, or any other assigned parameter. In short, you don’t just send notes: you sculpt them.
The two capacitive touch strips (pitch bend and modulation) replace traditional wheels. The result is smoother, especially for lead lines and evolving textures. The OLED display, paired with the clickable encoder, lets you quickly navigate parameters without getting lost in endless menus.
The KeyStep 37 mk2 is a controller-sequencer: it produces no sound on its own. Its sound quality depends entirely on the instruments you control (software synths, Eurorack modules, sound modules). On the other hand, the precision of its controls — velocity, aftertouch, modulation — makes playing noticeably more expressive and musical.
Sequencer and arpeggiator: an idea machine
This is where the KeyStep 37 mk2 really stands out. Its polyphonic step sequencer goes up to 64 steps and 8 simultaneous voices. You lay down a chord, turn it into a sequence, and chain patterns together. The workflow is smooth and intuitive.
The 16-mode arpeggiator includes generative pattern styles. Hold a chord and the KeyStep does the rest — with enough variation to keep things fresh. Combine it with the Mutate, Spice, and Dice functions, and you get a real-time idea generator. Mutate alters your existing sequences, Spice adds accents and rhythmic variations, while Dice reshuffles the deck for unpredictable results.
Use Scale and Chords modes to explore harmonies you wouldn’t naturally play. Scale locks the keyboard to a specific scale (so it’s impossible to play a wrong note), while Chords triggers full chords from a single key. It’s a powerful shortcut for composing quickly and effectively, even without advanced music theory.
Hybrid connectivity: from DAW to modular
The KeyStep 37 mk2 is designed for hybrid setups. On the digital side, you get class-compliant USB-C MIDI (no driver required) and full-size MIDI DIN input/output. On the analog side, its 4 configurable CV/Gate outputs (Pitch, Gate, Mod 1, Mod 2) directly control a Eurorack system or vintage synths.
The MIDI CC button and its 4 banks provide access to 16 assignable controllers in every mode. The 4 physical encoders can also be mapped to MIDI CC and CV/Gate destinations. Compatible with iPad (via a camera connection kit), the KeyStep is also a great mobile production companion.
You can record your pitch-bend and modulation gestures directly into the sequencer. Your automation becomes an integral part of the pattern — perfect for adding movement and life to an analog sequence without touching your DAW.
FAQ — Arturia KeyStep 37 mk2
Does the KeyStep 37 mk2 produce sound?
No. The KeyStep 37 mk2 is a controller-sequencer. It controls your instruments (software synths, hardware, Eurorack modules) via MIDI and CV/Gate, but generates no sound on its own.
Is it compatible with an iPad?
Yes. The KeyStep 37 mk2 operates via class-compliant USB-C, which means it is recognized without a driver. For iPad, you’ll need an Apple camera connection kit (Lightning or USB-C depending on your model).
What is the difference compared with the first-generation KeyStep 37?
The mk2 adds an OLED display, 4 additional encoders, smoother sequencer and arpeggiator editing, Mutate, Spice, and Dice tools for creative variations, plus improved connectivity and overall ergonomics.
Can it control a Eurorack modular system?
Absolutely. Its 4 configurable CV/Gate outputs (Pitch, Gate, Mod 1, Mod 2) can be assigned to velocity, aftertouch, or modulation. You can directly control an oscillator, envelope, or filter without an external converter.
Are Chords and Scale functions useful for beginners?
Yes, and not just for beginners. Scale mode locks the keyboard to a chosen scale to prevent wrong notes. Chords mode triggers full chords with one key. These are powerful tools for composing quickly and exploring new harmonies.
Our opinion on the Arturia KeyStep 37 mk2
With the KeyStep 37 mk2, Arturia strengthens its position in the compact controller-sequencer segment. Adding the OLED display, dedicated encoders, and generative tools such as Mutate, Spice, and Dice turns an already solid controller into a true creative platform. Whether you produce in a DAW, control a Eurorack rack, or combine both, this KeyStep fits naturally into your workflow.
For producers looking for a central hub with no compromises on connectivity or inspiration, the mk2 checks every box. It remains to be seen how it stacks up against the MiniLab 4 from the same manufacturer—but that’s another story.
