The Fredric Effects Demon Fuzz is a fuzz pedal built on the late 1970s Electro-Harmonix Muff Fuzz, the basic integrated-circuit version of that pedal. Fredric Effects describes the original as "a great-sounding mid-gain fuzz with only a volume control to fiddle with," and the Demon Fuzz keeps that character while adding "another couple of gain stages before and after the Muff Fuzz" for more drive and thickness1. It sits in the maker's fuzz line alongside pedals like the Standard Fuzz Machine and the DuoFace, and is one of many approaches covered on the Fuzz Pedals page.
What it does
The Demon Fuzz takes a pedal that originally had one control and turns it into a four-way fuzz. A switch selects between germanium and silicon clipping, and a second switch, labeled Doom, selects between the stock voicing and what Fredric Effects calls a "full-on thick fuzz with scooped mids"1. Guitar Pedal X summarizes the layout as "Clip : Ge/Si, Level, Doom (Thick Scoop)"2.
On the clipping choice, Fredric Effects says the germanium setting "sounds more 'open', almost like an overdrive," while "the silicon clipping is more crunchy and saturated"1. The Level control sets output volume, as on the original Muff Fuzz1.
What reviewers said
Guitar Pedal X's Stefan Karlsson reviewed the pedal in October 2025 and counted it as "at least the 2nd if not 3rd iteration" of the Demon Fuzz design, describing it as an improved version3. On the two clipping options, he wrote:
"I like the crunchier Clipping option - which I believe is the Silicon - it sounds amazing and textured - while the more open and overdrive-y Germanium sounds excellent too."
He placed it in the Big Muff style fuzz category and called it one of the most instantly satisfying fuzzes around3. In Guitar Pedal X's December 2025 roundup of the year's best new fuzz pedals, the Demon Fuzz appeared with a listed price of £99 / £1402.
Background and availability
Fredric Effects introduced the Demon Fuzz campaign in June 2025, with a show price of £99 that included a matching T-shirt3. The maker reported selling as many as 15 units during a single show since the campaign began, though things were slower at the recent Woking show3. The maker's webstore price is £1401.
The two published prices differ: the maker's product page lists £140, while Guitar Pedal X's year-end roundup gives £99 / £140. The £99 figure was the June 2025 show price with a matching T-shirt, not the standard webstore price132.
The pedal's artwork was custom drawn by Stacey Hine and is professionally screen printed onto each powder coated enclosure. Fredric Effects notes that Creative Review liked the artwork enough to feature it in the magazine's music issue1.
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Questions
What circuit is the Fredric Effects Demon Fuzz based on?
The Demon Fuzz takes the late 1970s Electro-Harmonix Muff Fuzz, the basic integrated-circuit version of the pedal, as its starting point. Fredric Effects describes that original as a great-sounding mid-gain fuzz with only a volume control, and the Demon Fuzz adds a couple of extra gain stages before and after that circuit to give it more push.
What does the Doom switch do?
The Doom switch selects a second voicing that Fredric Effects describes as a full-on thick fuzz with scooped mids, alongside the stock Muff Fuzz-style mode. Guitar Pedal X lists the control as Doom (Thick Scoop), so it is a single switch that toggles between the stock sound and the thick mid-scooped setting.
What is the difference between germanium and silicon clipping on the Demon Fuzz?
According to Fredric Effects, the germanium clipping setting sounds more open, almost like an overdrive, while the silicon clipping is more crunchy and saturated. Guitar Pedal X's reviewer liked the crunchier silicon option, calling it amazing and textured, and found the more open, overdrive-like germanium setting excellent too.
Who drew the Demon Fuzz artwork?
The Demon Fuzz artwork was custom drawn by Stacey Hine and is professionally screen printed onto each powder coated enclosure. Fredric Effects notes that Creative Review liked the artwork enough to feature it in the magazine's music issue.
Sources (3)
- Demon Fuzz, fredric.co.uk
- Guitar Pedal X, Guitar Pedal X, 2025-12-08
- Guitar Pedal X, Guitar Pedal X, 2025-10-15
