Expressive E’s Osmose: 7 Essential Tips for Gestural Synthesis Mastery

Expressive E positions the Osmose as a genuinely innovative MPE gestural synthesizer, aiming to make expressive play accessible to musicians of all backgrounds. The video opens with film composer Josh Madoff demonstrating the instrument’s remarkable sensitivity, which can be adjusted from standard to what he humorously calls “psychotic sensitivity.” Even the lightest feather-touch is detected, making the Osmose feel almost telepathic in its responsiveness.

This sensitivity isn’t just a party trick—it’s foundational to the Osmose’s design philosophy. Each key independently tracks vertical and horizontal gestures, allowing for nuanced, per-note control that goes far beyond traditional keyboard action. The result is an instrument that feels alive under your fingers, ready to translate the subtlest intention into sound, whether you’re a beginner or a seasoned performer.

One of the Osmose’s core strengths is its ability to modulate sound in real time through a combination of sensitivity settings, aftertouch, and pitch-bend—all independently per key. The video demonstrates how pressing a key halfway engages a cushion, and pushing further activates aftertouch, with each of the 500 internal presets responding differently. This means that every patch can offer a unique expressive palette, and aftertouch is not a global effect but a per-note phenomenon.

The gestural nature of the Osmose is highlighted through examples: a short attack produces one timbre, a gentle attack yields another, and aftertouch introduces yet another layer. These can be combined or played simultaneously, enabling complex, layered performances. Importantly, the video shows that these gestures are not mutually exclusive—players can blend them in real time, even with one hand, for dynamic soundscapes.

Pitch-bend is equally flexible. Madoff explains how the pitch-bend range can be set to fractions of a semitone, allowing for violin-like vibrato or more dramatic bends. The system is forgiving: set to a narrow range, even aggressive wiggles sound musical. This per-key pitch-bend, combined with pressure glide, opens up new expressive territory that’s simply not possible on conventional keyboards.

The Osmose’s MPE arpeggiator stands out as a truly unique feature, offering per-note tracking of dynamics and gestures. Unlike traditional arpeggiators that treat all notes uniformly, the Osmose tracks not just velocity but also left-right pitch shifts and vertical gestures for each note in the arpeggio. This enables performances where each note can have its own dynamic contour and pitch modulation, resulting in highly musical and intuitive patterns.

The video demonstrates how subtle variations in touch can create intricate polyrhythms and textures. Even notes played so softly they’re nearly inaudible can influence the rhythm, giving the player a level of control and expressiveness that feels more akin to classical piano technique than to typical synth arpeggiation. It’s a workflow that rewards both experimentation and finesse.

At the heart of the Osmose is the Eagan Matrix sound engine, which offers seven macro controls per preset for deep, immediate sound shaping. The video demonstrates how these macros, along with global effects like EQ, compression, and gain staging, can be mapped to external controllers via MIDI CC. This mapping process is straightforward, and every parameter in the internal engine is accessible, making the Osmose highly adaptable to different performance setups.

One standout aspect is the pre-gain control, which transforms into a wavefolder distortion when pushed beyond a threshold—instantly morphing a mellow flute into a gnarly, harmonically rich sound. This flexibility allows users to move from musical to experimental textures with just a few knob turns, reducing the need for post-processing and making the instrument equally at home in film scoring and sound design contexts.

Pedal integration is another area where the Osmose breaks new ground. Instead of the traditional all-or-nothing sustain, pedals offer 0–127 dynamic control, and the sostenuto function allows the keyboard to remain fully playable while holding and dynamically shaping chords. With two sostenuto pedals, users can bring in multiple chord sequences and control their dynamics independently, all while keeping both hands free for further expression.

The video closes by combining these techniques—macros, pedals, gestures, and the intelligent octave switcher—demonstrating how the Osmose supports complex, layered performances. For composers and performers alike, this architecture provides a scalable, expressive toolkit that encourages both precision and playfulness.