FM synthesis has a reputation for cold, clinical sounds, but it is also one of the most responsive synthesis methods once you give it a hand that can move. On September 30, 2026, Tupos Audio released MPE FM, a plugin and standalone instrument built around exactly that idea: FM sound design that responds to every finger individually.
Three FM engines in one instrument
The core of MPE FM is a choice of three operator engines. You can work with a 2-operator engine for quick, punchy tones, a 4-operator engine with 8 algorithms, or a full 6-operator engine offering 32 algorithms. That spans everything from simple bell and bass patches to the dense, evolving textures FM veterans know well.
For players who want to leave the algorithm chart behind, there is also a custom routing matrix that allows non-algorithm FM configurations. This is a welcome addition because per-note control is most interesting when you can decide precisely which operator a gesture should reach.
Per-note expression where it counts
MPE FM supports per-note pitch, pressure, and slide, the three core dimensions of MIDI Polyphonic Expression. In FM, those dimensions map naturally onto the things that make the method special. Pressure can push a modulator's level up, brightening a single note while the rest of a chord stays mellow. Slide can sweep a modulation index or a feedback amount. Pitch glides stay independent per note, so a bent note in the middle of a chord does not drag its neighbours along.
The developer also thought about players without an MPE controller. The plugin falls back gracefully to velocity, mod wheel, channel aftertouch and expression pedal, so a standard keyboard still gets meaningful expressive control. It also works with keyboards that send polyphonic aftertouch, a useful middle ground for owners of controllers that stop short of full MPE.
Built-in tools and workflow
Beyond the sound engine, MPE FM ships with a built-in arpeggiator, a sequencer, and a virtual keyboard, plus an effects chain with up to eight slots. A categorized preset browser keeps patches organized. According to the announcement, the main sound-design controls sit on the front panel, with separate views for presets, effects, sequencing and routing, which should keep the interface approachable for newcomers.
Price and availability
MPE FM costs €39.99. A launch discount of 25% is available with the code TUPOSMPEFMLAUNCH25 until October 10, 2026, and a 14-day free trial lets you test it with your own controller before buying. It runs as a plugin in your DAW and as a standalone application. Full details and downloads are on the official product page; the release was also covered by Audio Plugin Guy.
Why it matters for the MPE ecosystem
The MPE software catalogue has long leaned toward subtractive, wavetable and physical-modeling instruments. A focused, affordable FM synth designed around per-note control fills a real gap, and its low price makes it an easy way to try expressive FM with a controller you already own.
If you have an Osmose, a LinnStrument or any other MPE surface, the free trial is a low-risk way to hear what pressure-driven modulation index feels like. Expect the biggest rewards in electric-piano and bell-like patches, where a small change in finger pressure can move a sound from soft and round to glassy and bright.
For more on getting the most from expressive plugins, browse the rest of our coverage at mpesynth.com.