Purrtronics Resonant Quadruple Lo-Pass Gate


Resonant Quadruple Lo-Pass Gate

Functions: Filter , Low Pass Gate , Oscillator , Quad
Height: 3U
Width: 20hp
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Resonant Quadruple Lo-Pass Gate

Vactrols are back to life in a modern way!

RQLPG is a reinterpretation of the classic west coast circuit in a modern way to offer today's musicians the thrill of using a sacred monster in the most faithful form of the original.

It contains four independent paths, for four sound sources, that can work as:

  • Gate acting on the amplitude of the passing signal, like a voltage controlled amplifier,
  • Lowpass attenuating the signal in amplitude and at the same time, eliminating the acute ones.


  • - CV OFFSET pot for defining the Level / Gate or Frequency / Lowpass value.
  • - RESONANCE pot adjust the amount of Resonance without attenuating the passing signal by phase inversion.
    Without audio input it can resonate in self-oscillation if pushed beyond the limit.
    We will therefore have a sine controllable in tension and pitchable through the CV OFFSET parameter to make percussive sounds and an indescribably versatile and powerful kick drum.

Inputs and outputs:
Each channel has audio input, output connections and a CV input for control the CV OFFSET pot

Width: 20 HP.
Deep: 14 mm (Skiff-Friendly)
Current consumption: +12V: 75mA, -12V: 40mA.

75 mA +12V
40 mA -12V
0 mA 5V

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Purrtronics Resonant Quadruple Lo-Pass Gate