The Randy’s Revenge is a ring modulator from Fairfield Circuitry, the Canadian builder also known for pedals like the Shallow Water and the Four Eyes Fuzz. A ring modulator multiplies your guitar signal against an oscillator, producing the metallic, clangorous sidebands the effect is famous for. What sets the Randy’s Revenge apart is that its oscillator is a pure sine wave that is low-pass filtered, and that a low-pass filter on the output lets you tame the effect’s grating edge12.
Fairfield describes it as an all-analog design1, and Pedal of the Day’s review called it “another ingenious creation” from the builder, housed in a plain silver enclosure with true bypass2. As of October 2026 the pedal is listed as sold out on Fairfield’s product page, at a regular price of $455 CAD1.
What the Randy’s Revenge does to your signal
Ring modulation takes your instrument’s signal and multiplies it with an internal oscillator, generating sum and difference frequencies that were not in the original sound. The result at high oscillator settings is the bell-like, alien texture players associate with the effect. The Randy’s Revenge gives you two oscillator waveshapes, Square or Sine, selected by the top toggle switch, and two frequency ranges, hi and lo, selected by the lower toggle24.
The lo range is where the pedal gets versatile. Fairfield says the lower oscillator frequencies create “rich trem/vibe effects, excruciatingly slow or chopped up rhythmic flavours”1, which puts it in territory shared with tremolo and vibrato pedals rather than the usual ring-mod shriek. Delicious Audio’s buying guide notes that the low-pass filter, together with the Mix knob, “helps tame the ring modulation’s grating edge”6, so the effect can sit under a part rather than take it over.
The controls, as covered by Pedal of the Day and Delicious Audio24:
| Control | What it does |
|---|---|
| Freq | Big knob that adjusts the oscillator frequency, where most of the pedal’s different sounds come from2 |
| LFP | Controls the low-pass filter’s frequency, and affects only the modulated signal, letting you tame the effect2 |
| Volume and Mix | Work in tandem to dial in the wet/dry ratio and output level24 |
| Top toggle | Selects the oscillator waveshape, Square or Sine2 |
| Lower toggle | Puts the frequency into either Hi or Lo range2 |
The Mix knob lets you blend wet and dry signal, so subtle settings are possible alongside the full-on ring-mod sound4.
The CV input and VCO trick
The pedal has one TRS (stereo 1/4") CV input that can accept a standard expression pedal signal and can also be split4. Going the other way, the internal oscillator is available as an output, which Fairfield says turns Randy into a stand-alone voltage-controlled oscillator (VCO)1. That makes it a neighbor in spirit to synth and expression gear: you can drive the oscillator from outside, or feed its oscillator into other CV-compatible equipment.
Power and connections
The Randy’s Revenge runs on a typical 9V power supply through a 2.1mm DC connector12, with a current draw of 85mA3. Fairfield’s own FAQ is strict on voltage: the Randy’s Revenge, along with the Shallow Water, Unpleasant Surprise and Four Eyes, “will not function with anything other than 9V DC”5.
9V DC only. Fairfield states the Randy’s Revenge will not function on any other voltage, so check your power supply’s output before plugging in5.
What reviewers said
Delicious Audio’s Gus Green, reviewing the pedal in 2022, praised its tonal richness and its low-pass filter and CV options, writing46:
“In practice, this pedal is one of the more tonally rich than any of the other ring mods I have ever heard4.”
Gus Green, Delicious Audio4
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Questions
Is the Fairfield Randy’s Revenge true bypass?
Yes. Pedal of the Day’s review describes the pedal as true bypass, so your dry signal passes through untouched when the effect is off.
Can the Randy’s Revenge be used as a tremolo?
Yes, in effect. Fairfield says the lower oscillator frequencies create rich trem and vibe effects, from excruciatingly slow to chopped up rhythmic flavors. Set the Freq knob low in the lo range and blend with the Mix knob.
Does the Randy’s Revenge have a CV input?
Yes. It has one TRS stereo 1/4 inch CV input that accepts a standard expression pedal signal and can also be split. The internal oscillator is likewise available as an output, turning the pedal into a stand-alone voltage-controlled oscillator.
Is the Fairfield Randy’s Revenge analog or digital?
It is all analog. Fairfield Circuitry describes it as an all-analog design built around a pure sine wave oscillator that is low-pass filtered.
Is the Randy’s Revenge discontinued?
As of October 2026 the pedal is listed as sold out on Fairfield Circuitry’s product page, at a regular price of $455 CAD. Whether it returns to production has not been announced.
Sources (6)
- Randy's Revenge, Fairfield Circuitry
- Fairfield Circuitry Randy's Revenge Ring Mod, Pedal of the Day (www.pedal-of-the-day.com), 2016-11-22
- Randy's Revenge by Fairfield Circuitry, RockBoard PedalPedia, 2026
- Fairfield Circuitry Randy's Revenge, Delicious Audio, 2022-06-14
- FAQ - Fairfield Circuitry, Fairfield Circuitry
- 2024 UPDATE: Best Ring Modulator Pedals, Delicious Audio, 2024-02-13
