Brume is a 24-voice multi-timbral desktop synth for the CM5

A desktop multi-timbral music machine with four synthesis engines, a 10″ touch surface, and one cable to your DAW.

Representative view · Harmonic engine · 1024×600 logical UI auto-scales to any HDMI panel

Four voices, four lineages.

Brume runs four synthesis engines with a shared voice tail (state-variable filter, amp envelope, modulation router), so patches stay coherent across very different sources. Each engine has its own mechanism for continuous spectral change: algorithm routing and per-voice FM-index envelopes in FM, a scanning window in Harmonic, cascaded wavefolding in Timbral, grain scatter in Granular. No samples sit anywhere in the signal path; every voice is generated from live math.

Every voice, the same path.

MIDI in, voice allocation, modulation, filter, envelope, mixer. Sends to delay and reverb. A Lua FX slot for custom processing.

One cable to your DAW.

One USB cable carries multi-channel audio out, bidirectional MIDI, and clock. Class-compliant — no drivers, no manager app.

Source

Brume

4 engines · 24 voices · dry + sends rendered per part.

Link · USB

Audio · MIDI · Clock

Class-compliant. One port. Stereo out plus planned per-part stems.

Destination

Your DAW

Bitwig, Logic, Ableton, Reaper. Arm a track, point at Brume, record.

Purpose-built on Compute Module 5.

Raspberry Pi OS Lite, Rust audio runtime, 10.1-inch capacitive touch. Boots fast. Bridges to your DAW over USB.

Engines

FM · Harmonic · Timbral · Granular

Polyphony

24 voices · 6 per part

Filter

SVF per voice, 2 ADSR per voice

Modulation

2 LFO + 2 step seq per part

Effects

Saturator · Chorus · Delay · Reverb

Sends

Per-part delay + reverb sends

MIDI

USB class-compliant, clock sync

Meridian

USB to DAW — audio + MIDI + clock

Display

10.1″ 1024×600 capacitive touch

Scripting

Lua 5.4 — sequencing, DSP, custom FX

Platform

Rust runtime, RT Linux, CM5 ARM A76

Four components. One cable.

Boot and play. The hardware is a deliberate assembly of off-the-shelf parts — the instrument is the software.

01 · Compute Module 5

CM5

Compute Module 5. Quad-core ARM A76, 8 GB RAM, 32 GB eMMC, wireless.

02 · Carrier board

Carrier Board

CM5 IO Board with USB OTG for multi-channel audio and MIDI to your DAW. HDMI, GPIO, Ethernet.

03 · Display

Touchscreen

Pick the HDMI touchscreen that fits your build. Brume’s UI is designed around a 1024×600 logical layout and auto-scales to whatever panel you connect — tap into the CM5 touchscreen ecosystem. Reference unit: 10.1″ 1920×1200.

04 · Software

Software

Brume installs onto Raspberry Pi OS Lite. The brumectl CLI adds the runtime packages, labwc/webkitgtk shell, audio config, presets, and systemd service; --update refreshes the binary and factory presets over SSH.

05 · Reference controller

Controller

Korg nanoKONTROL2 is the reference USB-MIDI controller — 8 knobs, 8 faders, transport, and per-strip S/M/R. Brume ships with a default CC-mapping JSON plus a Lua starter script.

06 · Deep-control surface

Deep surface

Novation Launch Control XL 3 positions as the deeper control option — 24 endless encoders, 8 faders, 16 pads, transport. In development as a first-class surface: dedicated CC-mapping JSON with a per-engine page layout, Lua starter scripts.

07 · Open control layer

Extend

Plug in a class-compliant MIDI controller, touch MIDI learn, save the mapping, then shape the behavior in Lua. Map a controller you like, then share the mapping and a starter script so everyone gets it out of the box.