Specifications

Modal filter bank and comb-filtered based resonator, for physical modelling synthesis.

Features

  • Three resonator models: modal resonator (as used in Elements), sympathetic strings (stack of comb filters), string with non-linearity/dispersion (comb filter with multimode filter and non-linearities in the loop).
  • Pseudo-polyphony of up to 4 notes. Each new note is played on its own virtual string, while the previously played note(s) still decay.

Controls

  • Number of strings/structures (1, 2 or 4).
  • Synthesis model (modal, sympathetic strings, string).
  • Main frequency (quantized in semitones).
  • Structure. With the modal and waveguide models, controls the inharmonicity of the spectrum (which directly impacts the perceived “material”). With the sympathetic strings model, controls the intervals between strings.
  • Brightness. Specifies the brightness and richness of the spectrum.
  • Damping. Controls the damping rate of the sound, from 100ms to 10s.
  • Position. Specifies at which point the structure is excited.

Inputs and outputs

  • Frequency, structure, brightness, damping and position modulation CV inputs with attenuverter (-8V to +8V).
  • “Strum” trigger input to indicate when a new polyphony voice needs to be allocated. Normalized to an edge detector detecting changes on the main V/Oct input, or sharp transients on the audio input. Detection threshold at 0.6V.
  • 1 V/Oct frequency input (-1V to +5V).
  • Resonator audio input, normalized to a filtered pulse/noise burst triggered by the “Strum” input. Modular level, up to 16Vpp.
  • Two audio outputs, splitting the signal into even/odd partials in monophonic operation, or even/odd notes in polyphonic operation.

Technical characteristics

  • Input impedances: 100k.
  • AD/DA: 16-bit, 48kHz.
  • Internal processing: 32-bit floating point.
  • Open-source hardware and firmware.
  • Easy firmware updates through an audio interface.
  • Cortex-M4 ARM processor.
  • 14-HP.
  • Current consumption: +12V: 110mA ; -12V: 5mA.

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.