The Stomp Under Foot Utility Muffin is a hand-wired fuzz pedal built as a recreation of Frank Zappa's modified Big Muff. Pedal of the Day describes it as "a recreation of Frank Zappa's, modified, late 1970's Big Muff," while Premier Guitar calls it a homage to Zappa's much-modified 1970 Big Muff V312. It is not a straight Big Muff clone: the gain has been reduced, pushing it toward a low to medium overdrive/fuzz mix rather than full fuzz saturation1.
From Zappa's modified Big Muff to a limited run
The pedal's story runs through Zappa's own gear. Stomp Under Foot built a limited run of Utility Muffins in 2016, inspired by Zappa's pedal, and sold that run exclusively through Coast Sonic as the third effect in a collaborative series between the two companies1. Premier Guitar reports that the pedal was later revived for a wider audience2.
The name comes from Zappa's recording studio, the Utility Muffin Research Kitchen12.
How it sounds
Because the circuit is a modified Big Muff, the two reviewers frame it in Big Muff terms, but both hear something softer than the original. Premier Guitar's reviewer found that "critical modifications had been made to reduce the pedal's gain," yielding smoother, richer bass response and moving it closer to a medium-gain overdrive and low-gain fuzz2. The same review places the tone "on the warm, creamy, and thick side of the tone spectrum, even by Big Muff standards"2.
"The Utility Muffin cooks up a fun, alternative breed of fuzz that's expressive and somewhat habit forming."
Pedal of the Day hears it similarly: "The pedal yields a full-bodied, smooth, low-end and sweet highs with a little bite on lead notes," making it "more of a low to medium overdrive/fuzz mix"1.
Controls and build
The pedal keeps a familiar three-knob layout. According to Premier Guitar, the gain, tone, and volume controls "do much of what they would on any Big Muff," so players coming from a Big Muff-style fuzz will find the layout immediately familiar2. Despite the simple control set, Pedal of the Day notes that "this one has a lot of sounds under the hood"1.
The build is a point of emphasis for the maker. The circuit is a cleverly reconfigured four-transistor fuzz design that includes several NOS (new old stock) components2, and Matt Pasquerella of Stomp Under Foot hand-wires everything himself2. Pedal of the Day likewise lists it as handmade in the U.S.A.1.
Where it sits in Stomp Under Foot's range
Stomp Under Foot builds a number of Big Muff-inspired pedals, and the Utility Muffin is the reduced-gain, overdrive-leaning end of that line. Players comparing it within the maker's catalog might also look at the Stomp Under Foot Ram's Head, the Stomp Under Foot Green Russian or the Stomp Under Foot Op-Amp Fuzz for more conventional full-fuzz Big Muff voicings, or the Stomp Under Foot Sonic Generator for a different fuzz approach altogether2.
Videos
Demos In The Dark
Pedal of the Day
Shawn Hatfield
Questions
Is the Stomp Under Foot Utility Muffin based on a Big Muff?
Yes. Pedal of the Day describes it as a recreation of Frank Zappa's modified late 1970s Big Muff, and Premier Guitar calls it a homage to Zappa's much-modified 1970 Big Muff V3. The circuit is a reconfigured four-transistor fuzz design with several NOS components, and the gain has been reduced compared with a stock Big Muff, which gives it a smoother, richer bass response closer to a medium-gain overdrive and low-gain fuzz.
Why is it called the Utility Muffin?
It is named after the Utility Muffin Research Kitchen, Frank Zappa's recording studio. The name ties the pedal directly to the modified Big Muff Zappa used, which the circuit recreates.
Who designed the Utility Muffin and does he build it by hand?
The pedal comes from Stomp Under Foot, whose builder Matt Pasquerella hand-wires everything himself, according to Premier Guitar. Pedal of the Day likewise notes the pedal is handmade in the U.S.A.
Does the Utility Muffin sound more like a fuzz or an overdrive?
It sits between the two. Pedal of the Day calls it a low to medium overdrive/fuzz mix with a full-bodied, smooth low end, sweet highs and a little bite on lead notes. Premier Guitar found it leans toward the warm, creamy and thick side of the tone spectrum, even by Big Muff standards, with reduced gain yielding smoother, richer bass response.
Sources (2)
- Stomp Under Foot Utility Muffin Overdrive Fuzz, Pedal of the Day, 2025-07-31
- Zappa’s Big Muff Reborn!, Premier Guitar, 2021-04-04
