Specifications

Overview

The first 3 channels are square/pulse digital oscillators, generated by subdivisions of a 4 MHz clock. 5 preset duty cycles settings are available from 50% to 95%. In addition, channel 4′s CV input can be used as a PWM CV for channels 1 to 3, with a 120° dephasing between each channel.

Channel 2 can be hardsynced to channel 1. Channel 2 and 3 are also equipped with a XOR ring-modulator, blending their harmonics with those of Channel 1.

The fourth channel uses a 12-bit DAC without oversampling/reconstruction filter to generate low-fi waveforms at a 48kHz sample rate. The available waveforms are sine, triangle, NES triangle, and various flavors of pitched LSFR noise.

Advanced features

  • Optional semitone quantizer on the pitch CV input.
  • Per-channel mini step sequencer (8 steps) – perfect for creating rapid fire arpeggios. When the sequencer is active, the GATE input works instead as a CLOCK input.
  • Auto-calibrate feature digitally scaling the 1 V/Oct CV input to compensate for inaccuracies in CV converters… or to be used creatively to achieve other tunings than 1 V/Oct.

Technical characteristics

  • Units manufactured before september 2015 require a 5V voltage source (for example Mutable Instruments Volts).
  • All inputs: 100k impedance, DC to 2 kHz.
  • Channel 1 to 3: 4MHz, 1-bit.
  • Channel 4: 48kHz, 12-bit.
  • Open-source hardware and firmware.
  • 20-HP.
  • Current consumption: +12V: 70mA ; -12V: 20mA.

DIY and mods options

DIY expander PCB.

  • MIDI input; with MIDI mode switch (multitimbral: 1 channel per voice ; or polyphonic: 1 single channel with notes dispatched to the 4 voices) and MIDI channel learn switch.
  • Sub-oscillator for channel 1 with NES-style stepped triangle waveform.

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.