Expressive E's Osmose CE: A MIDI Controller Built for Software Musicians

Expressive E has announced the Osmose CE, a new MIDI controller that strips away the built-in synthesizer from its flagship Osmose keyboard while keeping the distinctive keybed. The goal is simple: give music producers working with software instruments access to Expressive E's expressive keyboard technology without the cost and complexity of a full synthesizer.

A MIDI controller is essentially a keyboard that doesn't make sound on its own — instead, it sends commands to other software or hardware that does. The Osmose CE does this while offering something most MIDI controllers cannot: the ability to control individual notes in expressive ways.

What Makes the Osmose Keybed Special

The original Osmose synthesizer cost $1,799 and launched in 2020 after years of development. At its heart is a keybed that responds to three kinds of touch: vertical pressure (like how hard you push down), lateral movement (bending individual notes left and right), and a sideways wiggling motion that creates vibrato or other effects. This is different from ordinary keyboards, which typically only measure how hard and how fast you press a key.

This level of detail matters because it lets you apply effects to single notes rather than your whole keyboard at once. For instance, you could intensify the filter on just one note while keeping others unchanged, or bend one note in a chord while the rest stay still. These are techniques that professional keyboard players have always wanted to do on synths, but traditional MIDI controllers haven't supported them well.

The technology that enables this is called MPE, which stands for MIDI Polyphonic Expression. Expressive E didn't invent it, but their keybed is one of the most developed implementations available.

The Market Shift Behind This Decision

There is a broader trend at work here. Over the past decade, we have seen this pattern before when hardware samplers gave way to software samplers paired with control surfaces. The Roland MV series gave ground to Maschine-style workflows. Dedicated drum machines evolved into Push controllers running Ableton Live. Each time, the shift happened because software capabilities caught up to and then exceeded what hardware could do at the same price point.

The same is happening with synthesizers and sound design. Software instruments have become sophisticated enough that many musicians no longer need hardware synthesis engines. What they do want is a keyboard that feels good to play and can communicate nuance to their software.

The Osmose CE reflects Expressive E's realization that their keybed technology might appeal to more musicians if it wasn't bundled with synthesis tools most of them already own as plugins or subscriptions. By selling the controller separately at the same $1,799 price point, the company can address two different markets: hardware synth enthusiasts who want the original Osmose, and software-focused producers who only need a great controller.

How It Actually Works

The Osmose CE connects to your computer through standard MIDI, which all DAWs (digital audio workstations—your recording software) understand. But to get the most out of it, your software instruments need to support MPE. This is the catch.

Many modern software synthesizers do support MPE—tools like Native Instruments' Kontrol series, Roli's Seaboard, and a growing number of plugin instruments. But not all of them do. If you try to use the Osmose CE with software that doesn't understand MPE, the extra expression data goes unused. You get a keyboard that works, but you lose the whole reason you paid premium money for it.

The keybed itself is built with a hybrid approach that sits somewhere between traditional weighted piano keys and the soft, sensor-based surfaces found on controllers like the Roli Seaboard. It allows normal playing techniques while adding the pressure and lateral sensing that unlock the expressive features.

What This Means for You

The controller market has seen several attempts to extend what keyboards can express beyond the limits of basic MIDI. Roli got there first with the Seaboard and built up a user base. Keith McMillen and Haken Audio have pursued different designs and sensing approaches. Success in this segment tends to come from having a strong software ecosystem ready to receive and use the data—not just from hardware innovation alone.

The Osmose CE's value depends heavily on your software library. If you work with MPE-compatible instruments, you'll unlock capabilities that justify the premium price. If most of your plugins don't support it yet, you'll have a very expensive basic MIDI keyboard.

The broader question is whether MPE will become a standard feature across music software the way MIDI became standard. The technical foundation is solid, but adoption in the creator community is still uneven. Expressive E is betting that releasing a controller-only variant will help build that ecosystem by lowering the cost of entry for curious musicians.

What's Next

Expressive E has not yet announced when the Osmose CE will ship. The company's experience manufacturing the original Osmose suggests they have production figured out, but redesigning it as a controller-only device will take additional work.

The broader market context matters here. If DAW makers like Ableton, Logic, and Cubase build better tools to route and use MPE data, the Osmose CE becomes more valuable to more people. If software instrument makers add MPE support to their plugins, the controller has more things worth plugging into. Neither of these is guaranteed, but both are plausible.

In this author's view, the move makes business sense for Expressive E. They're acknowledging that for most musicians, the future of synthesis is hybrid—some sounds come from hardware, but more come from software. A controller that sits between your hands and your DAW, preserving the nuance of your playing, fills a real gap. Whether it becomes standard or remains a niche tool for professionals will depend on forces beyond Expressive E's control: the choices of software makers and the playing preferences of musicians themselves.