Humble AudioQuad Operator FM Oscillator Bank

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Humble Audio Quad Operator

The Humble Audio Quad Operator, is a four operator FM synthesis voice, seemingly with eyes toward the Yamaha DX-1000 for inspiration. The module includes a one-knob-per-function design to add a more exploratory nature to an infamously woggly synthesis architecture. It substitutes the concept of a traditional "FM algorithm" with a full FM matrix, by which any modulation routing can be created.

The Quad Operator can also be coupled with the Algo expander module, which provides save and recall as well as a cross-fading capability that unlocks morphing patches and sounds! Each operator also has independent tuning and patchability, giving the user the option to use Quad Operator as an oscillator bank. Additionally, the module includes a section for FM at audio rate, meaning that you can use any other voice from your modular system as a modulation source, or you can plug one of your operators back into itself for feedbacking fantasia!

Quad Operator Features

  • One Knob Per Function Design
  • Any FM algorithm possible via the modulation matrix
  • Virtual VCA per operator
  • Independent Output per operator
  • Eurorack module
  • Width: 30hp
  • Depth: 25mm
  • Current draw: 140mA @ +12V, 13mA @ -12V
Product Demo Videos
Humble Audio Quad Operator & Algo Eurorack Four Operator FM Oscillator
Humble Audio's two modules, the Quad Operator and Algo are a powerful four operator FM oscillator bank for your eurorack system. Read our Signal article for more information on the Quad Operator and FM synthesis

The Quad Operator has a full 4x4 modulation matrix for modulating any of the operators with any of the others. It is even possible for an operator to modulate itself and quickly turn into noise. The operators can be locked into harmonic ratios for creating melodic sounds or can be used in free running mode to create detuned metallic percussion sounds. The Algo adds a macro control to the Quad Operator so that you can morph between two different sounds.
Humble Audio Quad Operator FM Oscillator Bank Reviews