Brume is a new desktop synthesizer that squeezes 24-voice polyphony into a Raspberry Pi Compute Module 5 chassis. The instrument features a 10.1-inch capacitive touchscreen and delivers multi-timbral sound through four distinct synthesis engines, each with unique spectral manipulation capabilities. A single USB connection handles audio, MIDI, and clock synchronization to your DAW.

Each engine processes sound differently: FM uses six operators across twelve algorithms with per-voice envelopes, Harmonic employs additive synthesis with Gaussian scanning windows, Timbral routes triangle waves through wavefolding shapers, and Granular scatters pitched micro-oscillator grains. All voices share a state-variable filter and modulation router for consistent patch behavior, while a Lua FX slot enables custom processing without samples anywhere in the signal chain.

The hardware combines off-the-shelf components around the Compute Module 5's quad-core ARM A76 processor with 8GB RAM. Raspberry Pi OS Lite boots quickly into the Rust-based audio runtime, and the UI automatically scales from a 1024×600 logical layout to any HDMI panel. Reference controllers include the Korg nanoKONTROL2 and Novation Launch Control XL 3.

This represents a significant shift toward open, hackable synthesizers built on commodity computing platforms. Musicians can modify behavior through Lua scripting while accessing pro-level features typically found in much more expensive hardware. The instrument ships with macOS and Linux support.