Arturia KeyStep 37 mk2: Hybrid Control, Reimagined

Arturia introduces the KeyStep 37 mk2 as a compact keyboard controller and creative sequencer purpose-built for hybrid setups. The device is positioned as a bridge between software, hardware synths, and modular gear, aiming to keep creative flow uninterrupted whether you’re patching a modular system or sketching ideas in a DAW. The video emphasizes that this isn’t just a MIDI keyboard—it’s a workflow tool designed to spark ideas and facilitate seamless transitions between different production environments.

The KeyStep 37 mk2 builds on the foundation of the original KeyStep series, combining a slim-key keyboard with sequencing, arpeggiation, and chord modes. Arturia’s focus here is on hands-on control and performance workflow, with the mk2 iteration promising deeper interaction with generative features. The approach is clearly architectural: the device is meant to be the connective tissue in a modern, multi-instrument rig, rather than just a peripheral.

Central to the KeyStep 37 mk2’s appeal is its integrated sequencer, which allows users to record and playback polyphonic patterns. This makes it straightforward to sketch chord progressions or melodic ideas and loop them instantly—a workflow that’s particularly attractive for those who want to move quickly from inspiration to iteration. The device’s sequencer is demonstrated as a tool for both composition and live looping, with a focus on immediacy.

The arpeggiator extends this creative potential by transforming held notes into rhythmic patterns. Users can switch between classic and more generative arpeggiator modes, injecting movement and variation into static chords. The video shows how changing note density and pattern type can breathe life into otherwise simple progressions, reinforcing the KeyStep 37 mk2’s role as a performance-oriented controller.

A standout feature in the mk2 is the mutate function, which takes existing sequences or arpeggios and generates musical variations on the fly. This approach is designed to foster creativity without forcing the user to start from scratch every time they want a new idea. The mutate feature is shown gradually transforming a sequence into a new melodic variation, highlighting its value for live improvisation and generative workflows.

Unlike the previous generation, where mutation was mostly tied to how long you held a button, the KeyStep 37 mk2 offers mutate as a fully controllable performance tool. The four rotary encoders provide fine-grained control over mutation parameters, such as note probability, pitch jumps, polyphony introduction, and pattern density. This hands-on approach allows users to sculpt generative behavior musically, rather than relying solely on randomness.

Physical control is a major upgrade in the KeyStep 37 mk2, with five additional keys, two extra buttons, and four rotary encoders compared to its predecessor. These additions are not just about more controls—they’re about direct access to essential parameters without menu-diving. The new control button allows the encoders to remap automatically based on the current mode (sequencer, arp, chords, or mutate), keeping the workflow fluid and tactile.

LED visual feedback is another highlight, with a strip above the keybed providing immediate orientation. Users can see sequence progression, triggered notes, scale information, and evolving patterns in real time. This is particularly useful for complex or generative performances, where visual cues help keep the performer grounded. The video also demonstrates real-time chord shaping—adjusting type, spread, strum, and voicing—showcasing how these physical controls translate into expressive, nuanced performances.