2-channel trigger to signal converter.

Three control modes:

  • twin: Channel 1&2 share the same parameters but can be triggered independently.
  • split: Channel 1 is edited by knobs 1&2, channel 2 edited by knobs 3&4, with a simplified 2-parameter control scheme.
  • expert: Channel 1&2 are completely independent.

Four functions: ADSR envelope generator, LFO, tap-LFO, and 808-style bd/sd/hh generator. Four additional “hidden” functions.

ADSR enveloppe generator

  • Segment durations ranging from 0.2ms to 8s.
  • Quartic attack, exponential decay, exponential release.
  • Other fancy modes implemented in the code, waiting to be unlocked!


  • 0.03 Hz to 160 Hz.
  • 5 basic waveforms: square, triangle, sine, stepped, random.
  • Waveform variations and morphing for each of these: PWM, slope, folding/harmonics, step size, interpolation.
  • Phase at reset control.
  • Tap LFO can lock onto irregular rhythms.

Drum generator

  • Channel 1: 808 kick model with extra parameters (tune, punch).
  • Channel 2: 808 snare model with extra parameters (tune, decay).
  • Channel 2: A specific combination of settings transform the snare into a modelled 808 hi-hat.

Inputs, controls and outputs

  • 4 parameter edition pots.
  • Channel 1 & 2 trigger inputs.
  • Channel 1 & 2 trigger push-buttons.
  • Channel 1 & 2 CV/audio output.

Technical characteristics

  • 16-bit CV/audio generation with 48kHz sample rate.
  • Cortex-M3 ARM processor.
  • Open-source hardware and firmware.
  • 8-HP.
  • Easy firmware updates through an audio interface.
  • Current consumption: +12V: 60mA ; -12V: 2mA.

Olivier Gillet, Mutable instruments SARL 2011-2017. Except where otherwise noted, content on this site is licensed under a cc-by-sa 3.0 license.