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Humble Audio Quad Operator

Item: SYN0007034-000
Humble Audio Quad Operator Product Image
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Humble Audio's Quad Operator is a four-operator digital quad oscillator that masters linear FM synthesis. Digital, VCO, OSC, LF...  All product info

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  • 3 YEARS
  • 55.000 PRODUCTS

Product information - Humble Audio Quad Operator

Complex oscillator for linear FM synthesis

Humble Audio's Quad Operator is a four-operator digital quad oscillator that masters linear FM synthesis. The surface immediately scores with the "one control per function" principle and looks very tidy. Any FM algorithm can be implemented via the modulation matrix. This also makes classic Yamaha DX-7 sounds possible.

High functionality

Each of the four operators has variable waveforms, a virtual VCA to modulate the level, and can be decoupled from tracking. Due to the open structure, each operator is individually accessible and usable. In LFO mode, the overall tuning is significantly reduced, transforming the Quad Operator into a complex modulator source for other modules. Using the AR FM input, external (audio) signals can be fed into the module as a modulator.


With the optionally available Algo Expander, the Quad Operator can be expanded with functions such as memory locations, live mode and crossfader.

Humble Audio Quad Operator at a glance:

  • Eurorack module
  • Digital Oscillator
  • Linear FM synthesis
  • Variable waveforms
  • Free concatenation of operators possible
  • LFO mode
  • Virtual VCA per operator
  • Individual outputs per operator
  • Expandable with the Algo-Expander
  • 30 TE Width / 25 mm Depth
  • +12 V: 140 mA / -12V: 13 mA

Humble Audio Quad Operator // FM synthesis tonal exploration

Quad Operator Sample Pack by Jon Charnis


  • Manufacturer: Humble Audio
  • TE / HP: 30
  • Depth (mm): 25
  • + 12 V (mA): 140
  • - 12 V (mA): 13
Humble Audio Quad Operator Product ImageHumble Audio Quad Operator
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