Quad Operator

£475.00 (£395.83 ex VAT)

4 Variable Waveshape Operators for Linear FM Synthesis. Features intuitive one-knob-per-function interface.

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4 Variable Waveshape Operators for Linear FM Synthesis

Implementing frequency modulation synthesis completely from scratch in firmware, the Humble Audio 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 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, enabling the generation of phase locked, complex modulation signals
  • Firmware upgradeable

Width: 30hp
Depth: 25mm
Power (standalone): 140mA @ +12v / 13mA @ -12v
Power (with Algo): 145mA @ +12v / 13mA @ -12v