For more than two decades, the Haken Continuum has stood as one of the most expressive instruments a keyboardist can put their hands on. Its neoprene-covered fingerboard tracks pitch, pressure, and side-to-side movement independently for every finger, making it a favorite among sound designers, composers, and MPE (MIDI Polyphonic Expression) enthusiasts who want continuous, per-note control that a traditional keybed simply can't match. The catch has always been size and weight — the full-size Continuum is a serious piece of furniture. Haken's new Slim 21 is the company's answer to musicians who want that same expressive core without needing a dedicated studio corner for it.
A Familiar Engine in a Smaller Shell
The Slim 21 measures roughly 45 x 19 x 3 cm and weighs just 1.6 kg, making it dramatically easier to fit into a gig bag or a home setup with limited desk space. Despite the smaller footprint, Haken didn't cut corners on the part that matters most to performers: the playing surface itself. The unit still uses Hall-effect sensors, with up to 12 independent points of finger tracking, delivering the same continuous pitch, pressure, and timbre control that has made the Continuum family a reference point for expressive playing.
Under the hood, the Slim 21 runs the same EaganMatrix synthesis engine found in Haken's full-size instruments, combining virtual analog, additive, and physical modeling techniques. That means patches and performance techniques developed on a full Continuum should translate directly, which is good news for anyone building a practice or performance routine around the instrument and wanting a lighter travel companion rather than a second, different instrument to learn.
Two Octaves, One Clear Trade-off
The name gives away the compromise: 21 half steps, just under two octaves of range. That's a meaningful reduction from Haken's larger boards, and it puts the Slim 21 firmly in the category of an expressive solo voice or layering tool rather than a full keyboard replacement. For players who already use split-hand setups, or who primarily use the Continuum for leads, basslines, or textural performance rather than full chordal work, the narrower range is unlikely to be a dealbreaker. For anyone coming from a full 87-note Continuum Pro, it's worth trying before committing.
Price and Availability
The Slim 21 has been available since August 2026 at $1,799 / €1,949, positioning it as the most affordable entry point into Haken's flagship fingerboard technology to date. That's still a premium price relative to mainstream MPE controllers, but for musicians who have wanted Continuum-level expression without the size, weight, or cost of the full-size models, it closes a real gap in the lineup. Full details and ordering information are available directly from Haken Audio's Slim Continuum page.
Why It Matters for the MPE Ecosystem
The broader MPE controller market has spent the last few years chasing accessibility — smaller footprints, lower prices, easier integration with software synths — without necessarily compromising on expressive depth. Haken's Slim 21 is a strong data point in that trend: rather than designing a simplified instrument, the company shrank the housing around genuinely professional-grade expression hardware. That approach mirrors what we've seen elsewhere in the category this year, from more compact keybed controllers to software that makes MPE data easier to see and understand (more on that below).
For composers scoring to picture, sound designers building expressive patches, or MPE newcomers who've been curious about the Continuum sound but intimidated by the full-size instrument's footprint, the Slim 21 is arguably the easiest on-ramp Haken has ever offered into its ecosystem. It won't replace a full Continuum for players who need the extended range, but as a portable, road-ready expression controller running a genuinely flagship synthesis engine, it's a compelling addition to any MPE-equipped studio or live rig.
Musicians interested in exploring the format further can also look at Haken's other fingerboard models and accessories through the same Haken Audio store to compare range, weight, and price across the current lineup before deciding which Continuum fits their workflow best.