Additive synthesis and MPE have always looked like a natural pairing on paper. Additive engines build sound from stacks of individually controllable partials, and MPE gives you a continuous stream of per-note pressure, slide and pitch data. Connect the two and every finger on the controller can reshape its own harmonic spectrum. In practice, surprisingly few additive instruments have shipped with proper MPE input.

That list just got shorter. On September 1st, discoDSP released Vertigo 5.4, a free update for existing 5.x owners that adds MPE support alongside three new per-voice LFOs and a "Keep Section" that holds modulation, controller and effects setups across program changes. The update was announced as part of a wider round of discoDSP releases that also covered Bliss 3.22 and Discovery Pro 9.2.

Why per-voice matters more in additive synthesis

In a subtractive synth, MPE typically ends up routed to a filter cutoff, an oscillator detune amount or an effect send. It works, but you're still shaping a sound that was largely decided before you touched the key.

Additive synthesis is different. The timbre is the partial structure, and partial amplitudes and envelopes are exposed as first-class parameters. When MPE pressure can move those parameters independently on each held note, you get behaviour closer to acoustic instruments: one note in a chord blooming into brightness while the others decay, or a sustained pad where only the top voice gains upper harmonics as you lean into the key.

The three new per-voice LFOs matter for the same reason. A global LFO applied to a five-note chord makes all five notes wobble in lockstep, which reads instantly as "synthetic." Per-voice LFOs let each note drift on its own clock, and when their rate or depth is driven by MPE pressure or slide, the movement follows your hand rather than a fixed tempo. This is the same principle that makes physical modelling instruments feel alive, applied to a very different synthesis method.

The Keep Section is a live-performance feature

The other headline addition is easy to skim past. The Keep Section holds modulation, controller and effects setups across program changes, which means switching presets no longer resets the state you built during a performance.

For MPE players this is more useful than it sounds. Anyone who has gigged with a Seaboard, a LinnStrument or an Osmose knows the pain of a mid-set patch change that silently rebuilds your expression routings, drops a pitch-bend range, or resets a slide-to-cutoff mapping you spent an hour dialling in. Persistent controller state means the instrument keeps behaving the way your hands expect while the sound underneath it changes.

Where Vertigo sits now

Vertigo is a $149 additive synthesizer for macOS, Windows and Linux in VST, VST3, AU and AAX formats — worth noting for Linux users, who still have a fairly short list of commercial MPE-capable instruments to choose from. The 5.4 update is free for all 5.x customers, which follows discoDSP's unusually steady release cadence; the company also shipped Corona 7 in August with an expanded modulation matrix.

If you already own Vertigo, the practical starting point is to open a preset with a clear harmonic structure, assign pressure to partial brightness or spectral tilt rather than to a master filter, and route slide to something that changes the shape of the spectrum instead of its volume. Additive engines reward MPE mappings that touch the partials directly; treating pressure as a generic "louder and brighter" control wastes most of what the engine can do.

The bigger pattern

Vertigo 5.4 is a small update in isolation, but it fits a trend that has defined 2026 so far: MPE arriving as a mid-cycle feature in established instruments rather than as the headline of a new product launch. Several long-running synths have picked up per-note support this year through free point releases, and each one quietly widens the pool of sounds available to anyone playing an expressive controller.

For players, the practical upshot is that the question is shifting. It used to be "which synths support MPE?" Increasingly it's "which of the synths I already own has added it since I last checked?"

More information: discoDSP · Vertigo 5.4 announcement on KVR Audio