The ZVEX Vexter Fat Fuzz Factory is a fuzz pedal from ZVex, a version of the company's Fuzz Factory circuit with a three-position mini toggle switch that adds low-end content the standard pedal does not have12. Position 1 is a standard Fuzz Factory; positions 2 and 3 introduce what ZVEX calls "low" and "lower" frequencies to manipulate, oscillate, and mutate2. The maker says it sounds fantastic on both guitar and bass2.
The Vexter version reviewed here is the 25th Anniversary edition, with UV printed graphics commemorating ZVEX's 25th anniversary2. As of late October 2026, ZVEX lists it as sold out on its product page2.
A Fuzz Factory with a sub switch
The Fat Fuzz Factory is a version of the Fuzz Factory, and Premier Guitar's review describes it as building on the same core components and tone-generating capabilities as the standard pedal, using new-old-stock 1960s germanium transistors and a highly sensitive set of controls, but adding a switch that greatly expands the low end and shifts the range of the pedal's famous oscillating feedback to much lower registers5. Pedal of the Day describes the added control as a sub switch that lets you add in three different stages of low end, producing low, synth-y tones and sub-sonic booms4.
The three positions work like this:
| Toggle position | What it does |
|---|---|
| 1 | Standard Fuzz Factory2 |
| 2 | Introduces "low" frequencies; ZVEX says the lower sub content yields a deep and "chewy" sort of punctuation to grace notes in a high-gain gated setting2 |
| 3 | The lowest setting; ZVEX calls it an excellent way to create seismic disturbances, used for a bass-synth type of sound2 |
Premier Guitar's reviewer describes the same switch as setting the low-end frequency range, with positions 2 and 3 adding more sub-harmonic intensity and darkening and thickening the fuzz5.
Alongside the toggle, the pedal carries the Fuzz Factory's five highly interactive controls, which Premier Guitar lists as volume, gating, compression, drive, and a "menacingly labeled" stab knob that changes either the pitch of the pedal's oscillating squeal or the tone of the fuzz, depending on where the other controls are set5.
"five highly interactive controls for volume, gating, compression, drive, and a menacingly labeled stab knob, which can either change the pitch of the pedal's oscillating squeal or the tone of the fuzz, depending on where the other controls are set."
How it differs from the standard Fuzz Factory
The difference is the sub switch. Everything else, the core components and the controls, is shared with the standard Fuzz Factory5. In position 1 the Fat Fuzz Factory is a standard Fuzz Factory, so a player who wants the original sound can simply leave the toggle there2.
Guitar World's review of the Vexter Fuzz Factory line lists the family of options as the Hand-Painted Fuzz Factory, the Fat Fuzz Factory with its bass switch, and the Fuzz Factory 77. The Fuzz Factory 7 takes the low-end idea further: where the Fat Fuzz Factory has a 3-position toggle, the FF7 has a nine-position rotary switch covering what ZVEX describes as enormous sonic territory, from earthshaking low frequencies to figuratively "dog whistle" high frequencies8.
Does the Fat Fuzz Factory work on bass?
ZVEX presents the pedal as working on both instruments, saying the Fat Fuzz Factory sounds fantastic on both guitar and bass2. The maker's product page includes a sound sample of the pedal on a Fender '63 reissue Precision bass with passive pickups, played through an Ampeg SVT amplifier2.
Premier Guitar's review backs this up from the player's side, noting that the pedal's low-end expansion also helps it enhance the lower-register output of basses with what the review calls "Earth-shattering results"5. The review's pros list includes the pedal's ability to produce warm Moog-like emulations with both guitar and bass5.
For bass players comparing ZVEX fuzz options, the maker's range also includes the Woolly Mammoth Vexter, a bass-oriented fuzz, and the Super Duper Concert Bass Mod, a limited edition built around the Sunn Concert Bass sound.
What is the Vexter series?
Vexter is ZVEX's more affordable line. The parts inside Vexter pedals are identical to the hand-painted pedals; the difference is the finish2. Premier Guitar describes the Vexter edition as partially built in Taiwan with a silk-screened motif, compared with the hand-painted original5.
The specific Vexter Fat Fuzz Factory covered here is the 25th Anniversary version, which uses UV printed graphics rather than silk screening to commemorate the anniversary2.
Size and availability
The Fat Fuzz Factory Vexter measures 4.70" x 2.38" x 1.82" (LxWxH), the same dimensions ZVEX lists for the hand-painted Fat Fuzz Factory21. That is a compact footprint that leaves room on a pedalboard.
As of late October 2026, ZVEX lists the Fat Fuzz Factory Vexter as sold out, and the hand-painted Fat Fuzz Factory and the FFFTK01 custom-shop Fat Fuzz Factory are also listed as sold out216. The listed price for the Vexter version was $249.00 USD2.
What reviewers said
Premier Guitar reviewed the Fat Fuzz Factory and summarized its strengths as follows5:
- Enormously versatile
- Can be run in standard Fuzz Factory mode
- Minimal battery draw
- Massive volume capability
- Can produce warm Moog-like emulations with both guitar and bass
Pedal of the Day, reviewing the pedal in 2015, described the original Fuzz Factory as a go-to fuzz for players across the globe and one of the finest fuzzboxes available, and the Fat version as carrying the same controls plus the sub switch64. Guitar World's review of the Vexter Fuzz Factory called the pedal "iconic-looking" and gave build quality four and a half stars7.
Where the circuit came from
ZVEX says the Fat Fuzz Factory grew out of experimentation: the FFFTK01 custom-shop Fat Fuzz Factory is a prototype built when the company was experimenting with tone controls on the Fuzz Factory circuit6. That experiment became the three-position toggle that defines the production pedal2.
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Questions
What is the difference between the Fat Fuzz Factory and the standard Fuzz Factory?
The Fat Fuzz Factory builds on the same core components and controls as the standard Fuzz Factory, including NOS 1960s germanium transistors, but adds a three-position toggle switch. Position 1 is standard Fuzz Factory mode, while positions 2 and 3 add low and lower sub frequencies and shift the range of the pedal's famous oscillating feedback to much lower registers.
Does the Fat Fuzz Factory work on bass?
Yes. ZVEX says the Fat Fuzz Factory sounds fantastic on both guitar and bass, and the maker's page includes a sound sample recorded on a Fender '63 reissue Precision bass with passive pickups through an Ampeg SVT. Premier Guitar's reviewer found it enhances the lower-register output of basses with what the review called Earth-shattering results.
What is the Vexter series?
Vexter is ZVEX's more affordable line. The parts inside Vexter pedals are identical to the hand-painted versions, but the enclosures carry printed or silk-screened graphics instead of hand painting, and the Vexter Fat Fuzz Factory is partially built in Taiwan. The 25th Anniversary Vexter Fat Fuzz Factory has UV printed graphics.
How big is the ZVEX Fuzz Factory Vexter?
The Fat Fuzz Factory Vexter measures 4.70 inches long by 2.38 inches wide by 1.82 inches high, the same dimensions ZVEX lists for the hand-painted Fat Fuzz Factory. That is a standard small-pedal footprint that fits easily on a crowded pedalboard.
Is the ZVEX Fat Fuzz Factory Vexter still available?
As of late October 2026, ZVEX lists the Fat Fuzz Factory Vexter as sold out on its own product page. The hand-painted Fat Fuzz Factory and the FFFTK01 custom-shop Fat Fuzz Factory are also listed as sold out, so the pedal is not currently available direct from the maker.
What does the 3-position toggle on the Fat Fuzz Factory do?
It sets the low-end frequency range. Position 1 gives a standard Fuzz Factory, position 2 introduces low frequencies that ZVEX describes as deep and chewy punctuation for grace notes, and position 3 goes lower still, which ZVEX describes as a way to create seismic disturbances and bass-synth type sounds.
Sources (8)
- Fat Fuzz Factory, ZVEX Effects
- Fat Fuzz Factory Vexter, ZVEX Effects
- Fuzz Factory, ZVEX Effects (www.zvex.com)
- Z.Vex Effects Fat Fuzz Factory, Pedal of the Day (pedal-of-the-day.com), 2015-04-25
- Z.Vex Fat Fuzz Factory Pedal Review, Premier Guitar, 2013-06-18
- Fat Fuzz Factory, ZVEX Effects
- Z.Vex Vexter Fuzz Factory review, Guitar World, 2026-09-14
- Laura Bennett Fuzz Factory 7, ZVEX Effects
