Cyma Forma and Bambounou release RND, a one-button generative synth

Paris-based synth maker Cyma Forma and producer Bambounou have created RND, a pocket-sized, multi-timbral generative synthesizer with a single control: one button, with no keys, knobs or display. Its launch price is £149, $150 or €169, according to MusicRadar. The device was unveiled at Superbooth in 2026, where it drew strong opinions on both sides.

Each press generates between one and four sequences across four instrument tracks, each sent to a randomly chosen synth engine with a randomly generated patch; the previous idea is lost for good. Sequences take the form of loops, one-shot "jingles" or drones, rhythms follow Euclidean algorithms, and melodies use a scale drawn from a bank of 20. The makers call it an "inspiration machine" with more than 4 billion possible ideas.

The eight engines cover subtractive, FM, Karplus-Strong, supersaw, additive and noise synthesis, plus a 303-style acid engine and a speech synth recalling the Texas Instruments Speak & Spell. Some of the engines borrow open-source code from the now-defunct Mutable Instruments. The tracks are then randomly panned, mixed and sent through a randomised reverb.

RND has no battery or speaker and is powered over USB-C. It offers a 3.5mm stereo output, multi-track audio over USB-C and four-channel MIDI in via USB or a TRS Type A mini-jack, which allows transposing the sequencer and setting volume, reverb level and scales. Two further jacks handle analogue clock sync. In MusicRadar's test of 100 presses, just under half produced ideas the reviewers liked.