The Fuzzrocious Gray Stache is an analog fuzz pedal built on Big Muff-style circuits, made for both guitar and bass. Fuzzrocious describes it as based on the GGG-tuned and Civil War versions of a muff fuzz, and it carries the standard three Big Muff controls: volume, tone and sustain. What sets it apart from a straight Muff clone is a three-way mid switch that alternately scoops the mids further, flattens them, or boosts them for a more in-your-face, distortion-like tone1,2.
The mid switch and what it does to your sound
The tone stack is the heart of the pedal. according to RockBoard's PedalPedia, it can scoop the mids for a heavy, deep sound, flatten the mids for an even-keeled sound, or boost the mids for a more modern sound that punches through the mix1. MusicRadar's reviewer, Alex Lynham, described the three-way switch the same way: "the three-way alternately scoops them further, flattens them, or boosts them, for a more in-your-face, distortion-like t[one]"2.
Because the pedal was intended for use on both bass and guitar, the mid control doubles as a mix-fitting tool. Scooped mids suit heavy, deep parts; boosted mids help a fuzz sit forward in a band1,2.
How it handles low tunings and palm-muting
MusicRadar's reviewer found that "The Grey Stache handles palm-muting surprisingly well, and doesn't muddy up in lower tunings down to C - a tuning in whi[ch] Muff fuzzes tend to get excessively dark"2. For players in drop C or lower, that is the practical difference between a fuzz that turns to mud under the low strings and one that keeps note definition.
Pedal of the Day's reviewer, Mike B, was more colorful in his 2014 verdict: "This pedal is nothing shy of a Tyrannosaurus Rex trapped in an overdrive: beefy, chunky, fuzz, driving, meaty, rocking a[nd] rad"5. He also found the controls genuinely useful for tone shaping, writing that "they are all useful, and the more knobs you have, the more detailed you can get with your tone"5.
Versions and mods
The Gray Stache has appeared in several forms, and Fuzzrocious has offered it with mods that change what the pedal does5:
- Gray Stache Civil War Era Muff, the standard circuit
- Gray Stache with Clean Blend Mod, which blends in dry signal
- Gray Stache with Octave Jawn Mod, adding an octave circuit
- The Gray Stache/Heliotropic, a double fuzz combining two separate fuzz circuits in one enclosure4
Mike B's own demo version carried four knobs on top, a three-way toggle in the middle, a mod side toggle, an on/off switch and an oscillation switch, showing how far the platform can be customized5. He noted that "you can add any number of mods to make yours a custom job, and get it sounding exactly like you want"5.
The Gray Stache is an analog fuzz/overdrive that Fuzzrocious could be ordered with mods to make it a custom unit: as the maker's demo describes, "you can add any number of mods to make yours a custom job, and get it sounding exactly like you want"5. The demo version layout has four knobs on top, a 3-way toggle in the middle, a mod side toggle, an on/off switch and an oscillation switch5. It runs on 9V DC center negative at 2mA5.
Price and power
Delicious Audio listed the Gray Stache at $145 as of February 2026: "One-forty-five for the Grey Stache"4. The pedal runs on 9V DC, center negative, and draws 2mA, so it is no burden on a standard isolated supply or daisy chain1. Fuzzrocious publishes a Quick Start Guide (EN) as a PDF manual for the pedal1.
For players who want a Muff-style fuzz that can be voiced to sit in a mix rather than swamp it, the Gray Stache is the mid-focused take on the formula, with the Heliotropic as its smoother, four-knob sibling in the same maker's range412.
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Questions
What Big Muff circuits is the Fuzzrocious Grey Stache based on?
Fuzzrocious describes the Grey Stache as based on the GGG-tuned and Civil War versions of a muff fuzz. MusicRadar's review likewise says it was modelled on the so-called Civil War-era Big Muff, which is why it carries the standard three Big Muff controls of volume, tone and sustain, plus a three-way switch for the mids.
What power does the Grey Stache need?
The Grey Stache runs on 9V DC with a center negative plug and draws 2mA, according to the maker's specifications. That light current draw means it sits comfortably on a standard pedalboard power supply without needing its own outlet.
Does the Grey Stache work with bass?
Yes. Fuzzrocious built it as what the maker calls one versatile guitar AND bass-friendly monster, and MusicRadar's review notes it was intended for use on both bass and guitar. The mid switch helps: scooping the mids gives a heavy, deep sound, while boosting them helps it punch through a mix.
How does the Grey Stache handle low tunings?
MusicRadar's reviewer found the Grey Stache handles palm-muting surprisingly well and does not muddy up in lower tunings down to C, a tuning in which Muff-style fuzzes tend to get excessively dark. The mid boost setting is the natural choice for keeping low-tuned parts audible in a band mix.
Can the Grey Stache be ordered with custom mods?
Yes. Pedal of the Day's reviewer noted that you can add any number of mods to make yours a custom job. Fuzzrocious has offered variants such as a clean blend mod and an Octave Jawn mod, and the reviewer's own demo unit carried extra toggles for a mod and an oscillation switch.
How much does the Grey Stache cost?
Delicious Audio listed the Grey Stache at $145 as of February 2026. The Grey Stache/Heliotropic double fuzz, which combines the Grey Stache circuit with the Heliotropic in one enclosure, launched at $189.
Sources (5)
- Grey Stache by Fuzzrocious, RockBoard PedalPedia, 2026
- Fuzzrocious Grey Stache w/Diode and Momentary Feedback Mods review, MusicRadar, 2018-10-22
- Fuzzrocious Pedals Grey Stache Overdrive, Pedal of the Day, 2014-09-24
- New Pedal: Fuzzrocious Grey Stache/Heliotropic Double Fuzz, Delicious Audio, 2026-02-19
- Fuzzrocious Pedals Grey Stache Fuzz, Pedal of the Day, 2014-10-02
