ESI Xkey 37 – Ultimate Portability with Full-Sized Control

The ESI Xkey 37 provides a portable master keyboard solution for musicians and producers needing expressive, professional-level MIDI control in a compact chassis. Outfitted with 37 full-size keys, velocity response, and polyphonic aftertouch, this model delivers precise tactile feedback and creative flexibility. Integration with Mac, PC, iPhone, iPad, and every major DAW is seamless, allowing mobile music creation wherever inspiration strikes. With its sturdy aluminum shell and ultra-thin profile, the keyboard travels easily between studio and stage. Professional features are packed into a space-saving frame, ready for any creative setup.

Unique Features for Modern Creators

What distinguishes this model is the robust anodized aluminum body paired with authentic polyphonic aftertouch—uncommon among portable controllers. The supplied Xcable adapter enables 5-pin DIN MIDI output, plus expression and sustain pedal connections for extra performance options.

Compact Dimensions, Full Performance – Mobility Without Compromise

Traveling musicians benefit from a slim, lightweight instrument and USB-C bus-powered operation. Measuring just 553 x 135 x 16 mm, it fits easily into a laptop bag and connects with all major operating systems for hassle-free integration.

• Keys: 37 full-size, velocity-sensitive keys — delivers authentic piano feel in a portable package
• Travelers appreciate the 553 x 135 x 16 mm dimensions, allowing use in compact spaces and tight desks
• Weight: 1.0 kg — light enough for true mobile use without sacrificing build quality

Expressive MIDI Control for Advanced Performance

Playability is boosted by polyphonic aftertouch, pitch bend, modulation smart buttons, and octave shift controls. These advanced features offer nuanced MIDI expression for dynamic playing across synths, virtual instruments, and DAWs.

• Polyphonic Aftertouch: Individual pressure per key — unlocks professional-level dynamic control over compatible instruments
• Pitch Bend/Modulation/Octave Buttons: Pressure-sensitive rubber smart buttons — enables real-time performance tweaks without external controllers
• Connecting sustain or expression pedals via Xcable expands control for both traditional and modern techniques

Flexible Connectivity and Platform Support

Class-compliant USB-C ensures instant operation with Mac, Windows, and iOS—no drivers required. The included Xcable adapter brings 5-pin MIDI out and 1/4" pedal ports, while a USB-C to USB-A cable supports compatibility with a broad range of devices.

• USB-C Port: Plug-and-play with modern devices — no need for extra power adapters
• 5-Pin DIN MIDI Out: Via Xcable adapter — connect to classic synths and stage gear
• The software bundle—Bitwig Studio 8-Track, Steinberg Cubasis LE, WaveLab LE—lets musicians start producing immediately on any platform