MIDI ControllerOverreview

Expressive E Osmose CE

Every reviewer who was lent one calls the keybed a marvel. Every owner who bought one starts with the caveats.

10 sourcesUpdated
$999Typical US price

Score aggregates reviewer opinions across topics.

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Expressive E Osmose CE

The short version

What to know.

A 49- or 61-key MPE controller with no sound of its own, built on the Osmose keybed: keys that travel roughly twice as deep as a normal synth action and float a few millimetres left and right, so pressure and vibrato are per-note. Sources agree almost completely on the hardware — the aluminium chassis is excellent, the I/O is complete (DIN MIDI in and out, USB-C power and data, two pedal inputs), and the assignable-control set is thin for the money. They split on the things that decide whether you keep it: how the action feels over a long session, how much you get out of it when your instruments are not MPE-aware, whether the bundled Ctrl-e is a generous instrument library or the weak link, and whether $999 is a fair price for expression you may or may not use.

About this product

The “Controller Edition” of the Osmose, announced April 2026: the same expressive keybed, but no onboard sound engine — it drives software and hardware over USB-C and DIN MIDI, and ships with the Ctrl-e plug-in instead. Not the Osmose synthesizer (2023, €1,799), which keeps Haken Audio's EaganMatrix engine on board. Two sizes, otherwise identical hardware: 49-key at $999 and 61-key at $1,199.

Expressive E spent three years being the company that made the expressive keyboard and then priced it out of most studios. The Osmose — full-size moving keys that also press deep, rock sideways and read every finger independently — did what a decade of MPE controllers had not: it put per-note expression behind an interface a pianist already knows. It also cost €1,799, because half of that was the Haken Audio synthesis engine bolted inside.

The Osmose CE takes the engine out. What is left is the keybed, a screen, a DAW-control mode and Ctrl-e — a plug-in that bundles nine third-party synths and 900-odd presets already mapped to the gestures. It is $800 cheaper and, for anyone whose sound already lives in a computer, arguably the more sensible half of the instrument. Whether it is a $999 controller or a $999 instrument is the question the reviews keep circling.

A good fit for

  • Producers and composers whose instruments already speak MPE — Vital, Phase Plant, Pigments, Bitwig's own devices, SWAM
  • Anyone who wanted the Osmose keybed but not the €1,799 synth attached to it
  • Players who work in sustained, evolving material — pads, strings, ambient — where per-note swells and vibrato replace drawn automation
  • Ableton Live, Cubase, Bitwig and Logic users who want transport and mixer control without leaving the keyboard
  • Sound designers who would rather perform a filter sweep than automate one

Think twice if

  • You want one keyboard to do everything, including fast runs, glissandos and organ smears — the action resists that style
  • Your library is mostly sample instruments that ignore MPE data
  • You need a knob-and-fader control surface as well as a keyboard
  • Your DAW is not one of the four with a control script
  • You want the onboard EaganMatrix sounds — that is the Osmose synth, and it costs $800 more

The reviewer consensus

Agreement &
disagreement.

4 / 8topics divide opinion
connectivitybuildcontrolsportabilitykeybedintegrationsoftwarevalue
1 Strong agreement3 Mostly agree4 Divided opinions

Common ground7

  • The keybed is the reason to buy it. Nothing else offers full-size moving keys with per-note pressure and lateral vibrato, and the gestures are learnable rather than a new instrument.
  • Build quality is excellent — aluminium over a metal base, made in Expressive E's own Polish factory, with no flex or rattle reported.
  • The I/O is complete for both studio and stage: DIN MIDI in and out, USB-C for power and data, a second USB-C for clean power, and two assignable pedal inputs.

Points of contention4

  • How the action wears over a session: press reviewers found it effortless, while owners report sore hands and trouble with fast or percussive traditional playing.
  • How much you get out of it when your instruments are not MPE-aware — Kontakt and Omnisphere users report a much thinner experience than the MPE demos suggest.
  • Whether Ctrl-e is a generous instrument library or the weak, occasionally crash-prone link in the package.

A closer look.

8 topics · 4 divided
Left: criticalRight: positiveTighter lines: more agreement

Keybed

Leans positiveDivided opinions
Reviewer sentiment7 supporting sources
CriticalNeutralPositive

Band: opinion spread · Dot: weighted average

Sources split, and the split tracks who is holding it. Reviewers working from review units describe the most expressive keyboard action available — deep two-stage travel, lateral vibrato, and gestures that land within minutes rather than weeks. Owners who bought one report the same action tiring the hands over long sessions, fighting fast or percussive traditional technique, and occasionally clacking as released keys snap back. Both sides agree the surface itself is hard plastic; the “spongy” impression comes from the damper under each key, and the sensitivity is deeply adjustable.

Measured

A 49- or 61-key keybed with per-note control over tap, press, pitch bend, vibrato, shake, strum and expressive note-off (Expressive E specs). Sound On Sound measured a standard 165 mm octave width and 154 mm of playable white-key length, with about 9 to 10 mm of initial travel to a bed of resistance and roughly 10 mm more beyond it, plus about 3 mm of lateral float — where MusicTech cites an official aftertouch figure of seven millimetres.

vs. listeners — One verified buyer calls the action extremely stiff with almost no rebound; a long-term owner says sensitivity can be set so high that merely brushing a key sounds a note. Both are accurate — the note-on threshold, the velocity and pressure curves, and a lateral stabilization amount are all user-configurable and savable per preset, so two players can meet genuinely different instruments on the same hardware.

Where it splits
the most expressive action on the market, and intuitive from the first minute79%

“If you have even a modicum of keyboard technique then all the main, musically useful Osmose gestures are very easily achieved.”

Robin Bigwood, Sound On Sound
the resistance curve fights traditional technique and tires the hands21%

“I found the odd resistance curve of the keys to be more of an issue than the side to side wobble. You can expect your fingers to get sore if playing for prolonged periods.”

Walrusbongo, Gearspace
Link to this topic

The hardware

Specifications.

Checked

Playing surface

Keys
49
Encoders
7 endless
Display
Colour screen
MPE
Yes

Workflow

Arpeggiator
Yes
DAW integration
Ableton Live, Cubase, Bitwig Studio, Logic Pro

Connection

USB
USB-C
MIDI
DIN in, DIN out, DIN thru
Power
USB bus power

Physical

Weight
10,000 g
Dimensions
895 × 300 × 90 mm

Figures are for the 49-key Osmose CE; the 61-key sibling is 106×30×9 cm and 11 kg, otherwise identical hardware. Manufacturer-published figures, not measurements · from expressivee.com (archived), thomannmusic.com.

Follow the evidence

Sources 10

1–6 of 10 sources

Read with context

Limitations & method.

As of

What to keep in mind 7

  1. A read of where the reviews land as of August 2026. This is a young product — it shipped in April and the first full reviews ran in June, some on pre-release firmware with DAW integration still being finished, so several complaints may already have been patched.

  2. The people who liked it most were lent it, and the people with the sharpest criticisms paid for it. That gap is the most useful thing in this record, but it also means neither group is a neutral sample.

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