Cyma Forma RND Synthesizer

One-Button Hardware Synthesizer for Instant Musical Inspiration

The RND synth from cyma forma is a hardware instrument built on a single radical premise: stop playing, start listening. Co-developed with French electronic artist Bambounou, this one-button device generates a brand-new, unrepeatable musical idea every press — no presets, no samples, no menus. Each idea combines up to four simultaneous instruments into a complete sketch ready to be captured or routed into a larger production. Inside the plexiglass enclosure sits a synthesis engine pulling from eight sound sources with weighted probability so results stay mostly musical. This instrument is the right choice for producers and sound designers who want a tool that breaks creative blocks faster than any preset library.

Eight Synthesis Engines and Weighted Randomization

What sets this instrument apart from typical random patch generators is the depth of its sound design. Eight synthesis engines — subtractive, FM, acid, noise, speech, Karplus-Strong, supersaw, and additive — give the device a broad palette from analog-style basses to physical-modeled strings and vowel-formant timbres. Each engine has its own filter modes and modulation routing, and randomization uses tuned probability weights so most patches land somewhere musical. A single onboard reverb applies only to the stereo mix output, leaving the four USB-C audio tracks dry.

Synthesis Architecture — Eight Engines, Five Filter Modes

The sound engine uses eight different oscillator types rather than a single architecture, which is why each press yields such varied results. Five filter modes and random polyphony assignment keep every patch unpredictable.

• Synthesis Engines: subtractive, FM, acid, noise, speech, Karplus-Strong, supersaw, additive — broad palette covering basses, leads, percussion, and physical modeling
• Filter Modes: five distinct types per engine — shape tone independently
• Polyphony: up to 4 voices per instrument, randomly assigned — chords, drones, or monophonic lines depending on the patch

Sequencing and Scales — Euclidean Patterns Across 20 Modes

Each instrument runs its own internal sequence, and up to four Euclidean sequences can play simultaneously. Twenty selectable scales keep generated notes harmonically related.

• Sequencer Type: Euclidean, up to 4 simultaneous — rhythmically interesting patterns without manual programming
• Scales: 20 selectable modes — from common major/minor to Hirajoshi, Prometheus, and Persian
• Random Seeds: 4,294,967,296 possible patches — effectively infinite non-repeating ideas

Connectivity and MIDI — Nine Modes for Deep Integration

Despite the single-button interface, the device offers extensive connectivity. USB-C handles power and four-channel audio, while analog sync and MIDI integrate with external gear.

• Audio Outputs: 4-channel USB-C (pre-reverb) + stereo TRS mini jack (post-reverb) — capture stems or finished mix
• MIDI: 4-channel in/out via USB-C, 9 control modes — play individual tracks or send sequences externally
• Sync & Power: analog sync in/out (TS mini jack), MIDI clock in, 5V/1A USB-C — bus-powered from any standard USB source

Who Is It For — Producers, Sound Designers, and Live Performers

This instrument is the right choice for electronic musicians who feel creatively blocked by their preset libraries. It suits producers looking for instant starting points, sound designers hunting for unusual timbres, and live performers wanting a generative element. Because every patch disappears the moment the button is pressed again, the device rewards users who can capture ideas quickly — sampling into a DAW or recording the four USB-C stems. The full MIDI implementation also makes it useful as a multi-timbral sound source driven by an external sequencer.

The Cyma Forma and Bambounou Collaboration

Born from a collaboration between cyma forma, the French hardware maker known for its plexiglass instruments, and Bambounou, a Paris-based electronic artist, this device traces its concept to Bambounou's idea for a one-button synthesizer where every press randomizes the entire patch. First shown at SynthFest France 2026, the instrument continues cyma forma's tradition of minimalist hardware that prioritizes creative constraint over feature checklists.