Black Cat Ring Modulator



  • Frequency
    sets the modulation frequency
  • Normal
    sets the volume of uneffected sound
  • Effect
    sets the volume of effected sound


  • Input
    Accepts 1/4" input from guitar or other signal source.
  • Output
    Accepts 1/4" jack to convey output signal to amp or subsequent effect stages.
  • Loop
    Uses send and return cord to patch another effect into the normal signal path just before the output mixing stage.
  • C.V.
    Uses 1/4" stereo cord to patch conventional volume or expression pedal to Ring Modulator so sine frequency can be remotely controlled. Please note: This requires a "stereo" or two-way patch with a distinct "send" and "return" line for the control voltage. 5 volts out is "tip" and return is "ring".
  • 12VAC
    2.l-mm barrell connector, hooks 12vac to power-up the effect.



The Black Cat ring modulator was based on the rare and expensive Maestro ring modulator from the early 1970s. It is a complex effect, which gives weird metallic and sometimes non-musical sounds by using mathematical rather than harmonic blending of tones. Technically, it takes an input signal and modulates it with a sinewave oscillator to produce a sum and difference signal which is re-mixed with the original signal. The best sounds are made by attaching an external control pedal for the modulation frequency. Most standard voltage controllers (VC) with a stereo 1/4" plug on the end and just a potentiometer inside should work. This allows sweeping the modulation frequency as you play, or finding the "sweet spot" to the key you are playing in, for more harmonic sounds. You can play the same notes on the guitar and have it sound different by "playing" the pedal.

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