The Thorn Soundlabs Black Swamp Flex Fuzz is a fully analog fuzz pedal made in Nashville, announced in December 20251. Rather than one fixed fuzz voice, it is a multi-fuzz: Guitar Pedal X's Stefan Karlsson describes it as "a versatile Multi-Fuzz covering Fuzz Face, Tone Bender and Big Muff territory"2. It does that through an unusually deep control panel, seven knobs and two toggle switches, that reshapes the fuzz from tight and dark through to raw and searing.
The controls: seven knobs and two switches
Delicious Audio's Paolo De Gregorio says the pedal's philosophy is embodied in "its comprehensive seven knob control panel, which extends far beyond standard Gain, Volume, and Tone"1. Guitar World's Trevor Curwen lists the full set: Gain, Damping, Mid Freq, Volume, Bass, Mid, Treble, the Character S/N/H switch, the Hard Clip O/I switch and the bypass footswitch3.
| Control | What it does |
|---|---|
| Gain | Fuzz drive amount2 |
| Damping | Input filter controlling how much low end reaches the distortion circuit, for foundational tightening1 |
| Mid Freq | Sweeps the center of the midrange boost or cut1 |
| Volume | Output level2 |
| Bass, Mid, Treble | Three-band EQ2 |
| Character switch | Selects Smooth, Normal or Hot clipping responses1 |
| Hard Clip switch | Toggles between soft and aggressive asymmetric clipping1 |
Karlsson sums up the tone-shaping ability as "combining 3-Band EQ with semi-parametric mids and a Damping control," with the two toggles on top2. The Damping control is worth understanding before you dial anything in: Delicious Audio describes it as "a specialized input filter that dictates how much low end reaches the distortion circuit," which is what lets the pedal tighten up where a conventional fuzz would stay flubby1.
Voicings: Big Muff, Tone Bender and beyond
The two switches do most of the character work. Karlsson writes that "Hard Clip tightens and darkens for Big Muff styles, while Smooth, Natural and Hot! offer variations"2. Curwen frames it the same way: "With a choice of Smooth, Normal or Hot for the fuzz character, as well as the options of soft or hard clipping"3.
Delicious Audio describes the pedal's range as able to be "tuned for articulate, amp-like drive that stacks seamlessly or pushed into raw, searing territory, all while maintaining the organic, responsive feel of a pure analog signal path"1. That puts it in conversation with overdrive pedals and distortion pedals as much as with other fuzz pedals: with the Damping and EQ set moderately, it can sit closer to an amp-like drive than to a splattery vintage fuzz.
Karlsson's own preferred settings, which he describes as "sort of Tone Bender adjacent," give a starting point2:
- Gain at noon
- Damping at 9 o'clock
- Mid Freq at 3 o'clock
- Volume at 3 o'clock
- Character: Smooth
- Hard Clip: off
- Bass at 3 o'clock, Mid at 3 o'clock, Treble at max2
What reviewers found
Karlsson's April 2026 review praises the pedal's versatility and tone shaping, but he flags one limitation that matters to players who clean up from the guitar's volume knob: "It delivers substantial volume, but clipped sound remains when guitar volume is reduced, so it does not approach Germanium Fuzz Face cleanup"2. In other words, rolling back the guitar volume tames the pedal, but it does not go fully clean the way a germanium Fuzz Face style circuit can.
Curwen's Guitar World review, part of a round-up of Thorn Soundlabs' Freq series, types it simply as a fuzz pedal at $1993.
Price and availability
Guitar Pedal X reported in April 2026 that "The Black Swamp Flex Fuzz retails for $199 typically (190 euros / 166 pounds)"2. Guitar World's review lists the same dollar figure, $1993. Karlsson notes it is "available direct from Thorn Soundlabs, and at select international dealers, including in UK and Europe"2.
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Questions
Where is the Thorn Soundlabs Black Swamp Flex Fuzz made?
Delicious Audio describes it as a Nashville-made fuzz from Thorn Soundlab. It is available direct from Thorn Soundlabs and at select international dealers, including in the UK and Europe, according to Guitar Pedal X's April 2026 review.
What does the Hard Clip switch do?
Delicious Audio says the Hard Clip switch toggles between soft and aggressive asymmetric clipping. Guitar Pedal X describes Hard Clip as tightening and darkening the sound for Big Muff styles, while Guitar World lists it as the option of soft or hard clipping alongside the Character switch.
What do the Smooth, Normal and Hot settings change?
The Character switch selects between Smooth, Normal and Hot clipping responses, according to Delicious Audio. Guitar World describes it as a choice of Smooth, Normal or Hot for the fuzz character, working alongside the Hard Clip switch's soft or hard clipping options.
Does the Black Swamp Flex Fuzz sound like a Big Muff or a Fuzz Face?
Guitar Pedal X's Stefan Karlsson calls it a versatile multi-fuzz covering Fuzz Face, Tone Bender and Big Muff territory. He notes Hard Clip tightens and darkens for Big Muff styles while the Smooth, Natural and Hot settings offer variations, and that it delivers substantial volume but keeps some clipped sound when the guitar volume is rolled back.
How much does the Black Swamp Flex Fuzz cost?
Guitar Pedal X reported in April 2026 that it retails for $199 typically (190 euros / 166 pounds). Guitar World's review lists the price as $199.
Sources (3)
- New Pedal: Thorn Soundlab Black Swamp Flex Fuzz, Delicious Audio, 2025-12-17
- Guitar Pedal X, Guitar Pedal X, 2026-04-03
- Thorn Soundlabs Flex Series pedals review, Guitar World, 2026-08-29
