Mutable InstrumentsEurorack & modular
Texture synthesizer / granular processor (discontinued)
Clouds is an 18HP Eurorack granular texture processor designed by Émilie Gillet and sold by Mutable Instruments from 2015 to 2017. It records incoming stereo audio into a buffer of one to eight seconds and plays back clouds of grains from it, followed by a diffusion network and reverb. The module uses an STM32F405 at 168 MHz and a WM8731 codec.
Mutable Instruments firmware is MIT-licensed (STM32 code) and the hardware is CC-BY-SA-3.0. Derivatives may not use the Mutable Instruments name. Parasites by Matthias Puech also exists for Tides (v1.121), Warps (v1.01) and Frames (v1.21); those modules have no device page here, so only the Clouds build is catalogued. After Later Audio Monsoon and Typhoon ship Parasites / Superparasites-based firmware. Both Parasites and Beat-Repeat document some risk of bricking on flashing; see each entry.
Firmware for the After Later Audio Monsoon, a Clouds clone, that turns it into a TB-303-style voice with the Braids macro oscillator as its sole sound source, run through an Open303 filter and envelope.
by Pierre-Emmanuel Surga (paiheulevrai)
| Version | Date | Notes |
|---|---|---|
| v0.1.0-mvp | 2026-09-22 | First public MVP. |
Clouds firmware that rebuilds the granular mode around grain-spacing statistics (clump-free washes, quasiperiodic and rigid arpeggio timing), adds chord and detuned-pair grains, and replaces the spectral mode with a formant-preserving pitch shifter.
Brick risk. Flashing this carries a known, documented risk of damaging the device.
| Version | Date | Notes |
|---|---|---|
| typhoon-v0.8.0-alpha | 2026-10-07 | Pre-release. Build for Typhoon and Supercell-architecture modules; not verified on hardware. |
| v0.8.0 | 2026-10-07 | Pre-release. First public release; adds Voice mode. |
Clouds firmware adding a clocked beat-repeat and slicing mode ported from the Kammerl Kaske VST suite, plus a multiband Spectral Clouds mode that replaces the spectral processor.
Brick risk. Flashing this carries a known, documented risk of damaging the device.
Clouds firmware adding a CV-controllable shimmer reverb, the Resonestor dual resonator with Karplus-Strong plucks, extended granular options and a tempo-synced looping delay. Also exists for Tides, Warps and Frames.
Brick risk. Flashing this carries a known, documented risk of damaging the device.
| Version | Date |
|---|---|
| clouds-v2.01 | 2016-09-29 |
| clouds-v2.0 | 2016-09-05 |
Clouds, Parasites and Kammerl Beat-Repeat merged into one eight-mode image for Grayscale Supercell and Microcell hardware only.
| Version | Date |
|---|---|
| v1.0 | 2019-07-18 |