Sumu

Name: Sumu
Price: 179 USD
Author: Madrona Labs

by Madrona Labs · Synth · Additive and FM patchable synth

Not rated yet

Sumu is a patchable additive and FM synth from Madrona Labs, built around resynthesis with up to 64 partials per sound.

Every patch cord carries 64 channels, so each partial can be modulated and moved in a 3D field on its own. It costs $179 and has a demo mode.

Best for: Keys & Synths, Sound Design. Genres: Ambient & Cinematic, Electronic & EDM.

Keywords: additive, FM, evolving, sound design, cinematic, creative, inspired by, pads, sequencer, textures, visual feedback.

What it does

Sumu is Madrona Labs' synth for "additive + FM soundscapes": each sound is made of up to 64 partials, and every patch cord carries a separate signal for each partial, so you can modulate them one by one.

Additive engine: up to 64 bandwidth-enhanced partials per sound, so partials can be pure tones or noisier bands.
Resynthesis: the companion app Vutu analyses your own audio and turns it into partial files Sumu can play.
FM: FM synthesis alongside the additive engine.
64-channel patching: each patch cord carries 64 independent channels, so envelopes, LFOs and other modulation can act per partial.
Modules: ten modules, including envelopes, an LFO, a sequencer, a Pulses rhythm and noise modulator, and a modeled four-pole Moog-style ladder filter that can self-oscillate.
Spatialization: a 3D vector-field module moves partials around in space, with a live space view.
Visualization: 64-channel scope, bar-graph and waveform views show what each partial is doing.

Version 1.3.0. The demo has a reminder sound about every minute and no patch saving.

Source: Madrona Labs product page

When to use it

Sumu is the pick when you want to treat every partial as its own voice and patch slowly morphing, spatial sounds from them. Compared with Native Instruments Razor and the harmonic engine in Pigments 7, which also work with partials, Sumu is far more open: per-partial modulation, 3D placement and resynthesis of your own audio. It is less suited to fast preset browsing than Pigments 7 or Omnisphere 3. Within Madrona's range it is the most expensive and the deepest, against Aalto's simpler single-voice patching and Kaivo's granular and physical modeling.

Best for: evolving pads, spatial textures and resynthesizing your own sounds.
Genres: ambient, cinematic and experimental electronic music.
Look elsewhere if: you want a straightforward subtractive synth or a fast preset workflow; Pigments 7 or Vital are quicker to get around.
Tip: right-click a parameter to reach its hidden per-parameter LFO, and start from the factory presets before patching from scratch (Rekkerd).

What producers say

Early reviews see Sumu as a unique and rewarding sound-design synth that asks for some synthesis knowledge.

Rekkerd (Josh Turvey, 2025) called it "unique, explorative, and creatively enriching", praising the resynthesis with Vutu, the factory presets and aftertouch support.
Criticisms: Rekkerd noted a learning curve that assumes some knowledge of additive, FM and modular ideas, patch connections that get tricky in complex patches, and CPU strain with many instances.

Rekkerd review

Where to buy

Madrona Labs: $179

Tutorials and reviews

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