The Midium


Expressive E's description of the Expressive E Osmose 49-key polyphonic synthesizer and MIDI MPE controller


next-gen standalone expressive synthesizer.  add emotion &
movement to your music with a simple touch.

Osmose is the new standard for musical expressivity. Use intuitive gestures to control this standalone synthesizer and upgrade your playing & production skills. Press, bend, shake, strum & more to interact with keyboards & electronic sounds in a new organic way.
Whether you’re a veteran keyboardist, a workflow-oriented producer, a daring sound designer, or anything in between, Osmose will take your musical journey to uncharted places.

49-key gesture-sensitive keybed (semi-weighted)

custom expressive sound engine (by Haken Audio)

more than 500 presets with custom macros

external MIDI control w/classic & MPE keyboard configurations

large color screen & ergonomic UI

built-in MPE arpeggiator & innovative glide control

custom sensitivity controls

sleek & rugged design

explore new ways to play.

Behind the expressivity of Osmose lies a few natural gestures you already know well. Discover how they interact with Osmose and enhance your musicianship from the very first touch.

hear osmose in action.

Osmose is a collaborative project. We have thus teamed up with top musicians across the globe — from seasoned jazz & classical pianists to Grammy-winning trap producers - to make sound demos that help you see what Osmose can add to the music genres you love!

modern keybed craftsmanship.

Osmose’s identity lies in its custom, Augmented Keyboard Action (A.K.A.) keybed, its build quality, and a fun, ergonomic playing experience. These elements make this expressive synthesizer a reinterpretation of the work of traditional acoustic instrument makers.

a.k.a., augmented keyboard action.

Developed by Expressive E, the Augmented Keyboard Action (A.K.A.) is the technology inside every key of Osmose. It offers a seamless connection between every gesture played by the musician & the resulting sound.

This means that despite being an electronic synthesizer, Osmose feels more like an acoustic instrument to play. Press, bend, shake, strum, and more to create sounds that are truly yours.

3-axis motions for every key.

extended polyphonic pressure
Sound is produced as soon as you brush the keys, with an incredible level of nuance & dynamics.

hi-resolution polyphonic aftertouch
Past a certain pressure threshold, a new sound variation is triggered, with tremendous level of control & dynamics.

polyphonic pitch control
Add vibrato to notes and bend them by intuitively shifting keys from left & right. Each key’s pitch variations can be independent.

the EaganMatrix sound engine.

custom-made by haken audio
We designed Osmose’s keybed to pick up every gesture & performance nuance. We needed a sound engine that could interpret motion with the same degree of precision. The EaganMatrix continuously analyzes gestures and processes this data instantly to intimately control synthesis parameters. This allows for an organic connection between the player & the instrument, similar to a player’s interaction with an acoustic instrument.

a self-defining sound identity
EaganMatrix is a digital modular sandbox that offers a large palette of sounds. From virtual analog to FM synthesis, to physical modeling and more, Osmose displays an infinite landscape of unique, wild acoustic & electronic sounds. Every gesture & articulation can modulate various parameters of the synth engine in innovative & unexpected ways.

a modular approach to sound design
EaganMatrix is a laboratory of synthesis, made of unique building blocks for you to assemble creatively. If you want to go further with the sound design, the powerful EaganMatrix can be edited via the haken Editor (Mac/PC) software.

external connections.


Osmose features various connectivity options to help you in live and studio settings. The Osmose back panel contains L/R 1/4” jacks, two pedal inputs, a MIDI In/Out combo, and a USB port. A headphone jack socket with its own volume control is also featured on the front panel.

external midi.

Use Osmose as a MIDI controller to unlock the true potential of your favorite synthesizers. Connect to any soft or hardware synthesizers using Osmose's MIDI In/Outs and USB ports. Even if your synthesizer does not respond to polyphonic aftertouch or MPE, Osmose can still control it.

How to control your gear with Osmose → Using Osmose as MIDI controller

poly aftertouch and global pitch bend: Control your synth with Osmose’s Initial Pressure system & Poly Aftertouch. Every key can also control the global pitch bend of your synth.

piano mode: You may not always need added expressivity. If needed, Osmose can act as a classic keyboard controller, sending simple velocity messages.

standalone configuration: Set up your MIDI configuration directly from the in-built screen, without the need to connect to a computer.

fun & easy to play.

We have developed a custom operating system to translate the power of both the EaganMatrix sound engine and the A.K.A.. keybed into a fun & user-friendly experience.

ui.ux design.

Osmose’s in-house OS facilitates sound creation. No endless menu browsing, no constant “shift button” operating - we boiled down the feature set to its quintessence & added to the mix a large color screen, 500 macro-loaded presets, and efficient categorization.

playful learning.

Discovering Osmose is just plain fun. There will of course be a few wild bends at the beginning, but after a few minutes only, your playing will be at home and enhanced. Experiment with various gestures & twist every preset your own way - learning Osmose is a simple, rewarding journey.

simple to tweak.

With Osmose, it's easy to customize the timbres, textures, and effects of all presets. Give macro controls a simple twist to tweak multiple pre-mapped parameters at once. Each preset is equipped with macro controls to generate deep, satisfying changes without effort.

design and build quality.

Proudly designed in France, Osmose boasts a stealth black casing & signature key stems that will both please crowds and stand the test of time. Made out of rugged materials and assembled in a solid glueless design, Osmose is a road & studio-ready instrument.

ecodesign commitment.

To make Osmose more sustainable, we laid out a complete eco design plan, taking all steps of its lifecycle into account:
  • Osmose is made of 66% recycled materials
  • Its components are assembled without glue, meaning Osmose can be disassembled completely with only two commonly-found screwdrivers
  • Expansive resistance procedures were conducted to test the product in tough contexts
  • An auto-diagnostic tool was developed for Osmose to help solve customer support requests more efficiently & reduce unnecessary shipments



technical specs

keybed: 49 full-size keys with three-dimensional control
configurations: standalone synthesizer, MPE MIDI Controller, and classic MIDI controller
sound engine: EaganMatrix, a digital modular engine by Haken Audio
polyphony: up to 24 voices
interface: color LCD screen, pitch and modulation sliders
pedal inputs: 2 continuous pedal inputs, assignable to sustain or synth parameters
DIN MIDI In, MIDI Out/Thru, USB Type B
audio output: two ¼" TRS pseudo balanced line outputs, ¼" TRS headphone output
dimensions: 894 x 316 x 87.5 mm / 35.2" x 12.4" x 3.4"
weight: 8.3 kg / 18.4 lbs
power: external PSU with lockable connector, 12V, 1.5A, center positive
software: Software updater for new firmware and library versions; A Mac/PC editor to create and edit sounds