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Arturia's KeyStep 37 is a compact 37-note MIDI controller and polyphonic sequencer designed for hybrid modular, hardware, and software setups. Expanding on the original KeyStep concept, it adds five extra keys, four assignable encoders, enhanced chord functions, and harmony-aware sequencing, while operating independently of a computer when required. Its Slimkey keyboard is velocity- and aftertouch-sensitive, complemented by pitch and modulation touch strips for added expressivity. At its core lies a 64-step sequencer with eight memory slots, paired with a fully-fledged arpeggiator that moves beyond conventional up/down modes into repeatable, phrase-based sequencing. More than a simple keyboard controller, the KeyStep 37 functions as a self-contained musical sketchpad – built for generating ideas, reshaping sequences in real time, and driving hardware or software instruments intuitively.
The KeyStep 37's sequencing engine stacks up to eight notes per step across 64 steps, allowing chords and layered harmonies, while RGB LEDs above the keys provide clear visual feedback during sequencing and arpeggiation. Patterns can be programmed step by step in classic hardware style or recorded in real time, with Scale mode, transposition, swing, and loop-length adjustment available during playback. The arpeggiator builds on traditional up, down, and random modes with a dedicated Pattern mode that generates structured, repeating sequences that can be edited on the fly. Chord mode extends this approach with preset chord types, user-defined voicings, and velocity-dependent chord density, while the Strum function spreads notes over time for guitar-like articulation. Four assignable encoders control up to 16 MIDI CC parameters across four switchable banks, providing hands-on access to external hardware and software parameters.
The Arturia KeyStep 37 is aimed at musicians who value playability and real-time interaction within hybrid setups. Synth players and modular users benefit from its standalone sequencing and direct CV/Gate control, while producers can use it as a hands-on companion to DAWs, grooveboxes, or hardware workstations. Its extended keyboard range and expressive keybed make it particularly suited to melodic work, chord exploration, and live pattern manipulation. Because sequences can be transposed, extended, or reshaped during playback, it supports a fluid workflow that encourages experimentation without breaking momentum. For musicians who want a self-sufficient tool for generating and developing ideas away from the screen, KeyStep 37 offers a balanced blend of keyboard performance and pattern-based composition.
Arturia's success story began with software emulations of well-known analogue synthesizers such as the Moog Minimoog, Sequential Prophet-5, and Oberheim SEM. The popular software instruments included in the V Collection are still flagship products of the French developer today. Over time, Arturia has gradually expanded its range and now also offers a host of hardware devices, ranging from synthesizers and keyboard controllers to sequencers. Since then, the former software developer has thus also become a household name in the world of analogue synthesizers and other equipment.
Connectivity has always been central to the KeyStep concept, allowing it to operate confidently within both computer-based and hardware-focused environments. USB provides bus power and MIDI communication with DAWs and software instruments, while an optional DC input supports standalone use. Full-size MIDI DIN In and Out sockets connect directly to external gear. Dedicated CV/Gate outputs – pitch, gate, and modulation – address modular systems and analogue synths directly, while MIDI-to-CV conversion routes external keyboards or sequencers through the unit. Analogue Sync In/Out maintains stable timing with vintage and modern equipment alike, and a sustain pedal input adds further expressive control. Whether used on its own or within a larger rig, KeyStep 37 brings software, MIDI, and CV instruments into a unified workflow.
A complete production starter suite
Arturia's KeyStep 37 ships with a focused software package designed to complement its hardware sequencing workflow. Analog Lab Intro provides access to 500 curated presets drawn from Arturia's instrument catalogue, offering a broad range of synth, keyboard and hybrid sounds with streamlined macro-based control. Ableton Live Lite delivers a compact version of Ableton's production environment for recording, arranging and exporting within a DAW-based setup. Installation and firmware updates are managed via the Arturia Software Center. As bundled software may evolve over time, the manufacturer's website should be consulted for the most current package details. Detailed tutorials and manuals are also available online for users wishing to explore its deeper sequencing and performance functions.