Quad Operator

Quad Operator

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Inventory Available from Retailers in the US, Europe, and Japan

4 Variable Waveshape Operators for Linear FM Synthesis

Implementing frequency modulation synthesis completely from scratch in firmware, the Quad Operator is able to provide a modern take on frequency modulation synthesis.

  • One knob per function design for true ease of use
  • Any FM algorithm is possible via modulation matrix
  • The Algo expander module provides algorithm save/recall and crossfading capabilities
  • Independent output per operator
  • Virtual VCA per operator for both animating modulation and output volume control
  • Includes a dedicated “AR FM” input with its own modulation sends, designed to bring an audio rate signal in from your rack for use as a modulator. Try processing a phase locked operator, and feeding it back in!
  • Each operator can also be unlocked then tuned and patched independently, making the module a great general purpose oscillator bank
  • Convincing digital emulation of classic analog waveshapes—sine, triangle, square, and saw
  • An LFO mode, enabled the generation of phase locked, complex modulation signals




  • Current consumption: 

    • Standalone: +12V: 140mA, -12V: 13mA

    • With Algo: +12V: 145mA, -12V: 13mA

  • Width:

    • Quad Operator: 30HP

    • Algo expander: 4HP

  • Depth: 25mm

  • Firmware upgradeable

  • Humble Audio products are warranted for 12 months from date of purchase

Media and dealer assets are available here.