The SuperCool Pedals Thneed is a low-to-mid gain overdrive pedal from Canadian builder Supercool Pedals, first unveiled in August 20231. It is built on the Klon Centaur circuit, the transparent overdrive that has inspired a long line of pedals since the 1990s, but it takes that circuit in its own direction: where the Centaur has one fixed clipping setup, the Thneed gives you four selectable pairs of clipping diodes, a bass toggle on the front panel, internal gain modes and a choice of true or buffered bypass123.
The name comes from a Dr. Seuss-coined term signifying "a fine something that all people need"3. Delicious Audio's Paolo De Gregorio described the result as "a thoughtful and streamlined take on the classic transparent overdrive circuit" that captures the character and tone of the original3.
What it does to your sound
The Thneed is a light-to-mid gain overdrive, the same territory the Klon Centaur occupies. Tone Island's Adam Connell notes that the Klon "is a light-medium overdrive that uses hard clipping" and is most commonly used as a clean boost or "always on" pedal4, and the Thneed sits in that same family. Pedal of the Day found it to be "a highly dynamic and customizable drive pedal with a signature smooth and bright tone that cuts through the mix"1, while Delicious Audio described "a smooth, clear tone that naturally sits well in a mix"3.
The customization comes from the clipping options. Each diode pair shapes the drive differently, as Supercool Pedals' Jamie Muir explained when the pedal was announced2:
| Diode pair | What it does |
|---|---|
| Red LEDs | High-volume boost and amp-like break-up2 |
| 1N34A germanium | Warm, mid-boosted tone2 |
| BAT46 Schottky | "Just balls-out distortion"2 |
| 1N4148 silicon | Fourth selectable texture in the set1 |
Controls and switching
The Thneed's control set follows the Klon template with additions of its own. MusicRadar's coverage, based on Jamie Muir's own walkthrough, broke down the controls as follows2:
- Gain: Controls the amount of op-amp drive in the signal, with diode clipping applied depending on how far you turn the dial and how the internal controls are configured. Muir puts the sweet spot around the three-quarter mark2.
- Treble: A shelf EQ that can boost or cut frequencies above 1 kHz2.
- Unless: A face-forward bass toggle, described by Muir as "kind of like a fun gain wild card switch"12.
The Unless switch is the Thneed's most distinctive control. It works on the bass in the op-amp feedback loop, which means it affects how the pedal handles low end and adds op-amp drive when activated2. For a player, that makes it both a low-end shaping tool and a second gain control in disguise.
Inside the pedal are the internally selectable gain modes13, which widen the drive range beyond what the external Gain knob alone offers. And on the bypass question, the Thneed lets you choose between true bypass and buffered bypass13, a useful option if you run long cable runs or a large board where a buffer helps preserve high end.
How it differs from the Klon Centaur
The original Klon Centaur, designed by Bill Finnegan, is a legendary overdrive pedal5 that, per Finnegan, is not a tweaked version of any existing pedal circuit6. One of its signature features is an 18V charge pump that raises internal headroom, which gearnews.com's Jef Stone credits with giving the pedal "its famous amp-like response and dynamic range"7.
The Thneed takes a different route to the same territory. Pedal of the Day notes that it "does away with frivolities like a troublesome charge pump and multiple op amp stages, and instead opts for a more reliable design"1, and Delicious Audio echoes that it aims for simplicity and reliability without those features3. Where the Centaur's clipping is fixed, the Thneed's four diode pairs are selectable, and its gain modes are internal rather than fixed.
For context on the original's standing: Warren Haynes calls the Centaur the greatest overdrive pedal and says the Ibanez Tube Screamer can't beat it8, and Klon's own reissue, the KTR, ran about $400 as of a 2015 Performer Mag review9. The Thneed's CAD$219 pre-order price in August 20232 positioned it well below that.
"Not only will it improve your tone and overall sound, it will pop right off of your pedalboard for all to see."
Availability
When MusicRadar covered the Thneed in August 2023, the first batch had sold out and a second batch was available for pre-order direct from Supercool Pedals at CAD$219, approximately £1292. Supercool Pedals has since continued releasing pedals, including the Cutback preamp-style distortion in 2025.
Videos
Supercool Pedals
Pedal of the Day and Supercool Pedals
B's Music Shop
Questions
Is the Thneed true bypass or buffered?
Both. The Thneed gives you a choice between true bypass and buffered bypass, so you can run it either way depending on the rest of your pedalboard. A buffered bypass can help preserve high end on long cable runs, while true bypass keeps the pedal fully out of the chain when disengaged.
What does the Unless switch do on the Thneed?
Unless is a face-forward bass toggle. It controls the bass in the op-amp feedback loop, which affects how the pedal handles low end and adds op-amp drive when activated. Supercool Pedals' Jamie Muir described it as kind of like a fun gain wild card switch, so it can push the pedal harder as well as shape the bottom end.
Does the Thneed have a charge pump like the Klon Centaur?
No. The original Klon Centaur uses an 18V charge pump to raise its internal headroom, but the Thneed does away with the charge pump and multiple op-amp stages in favor of a simpler, more reliable design. It still aims to capture the character and tone of the original circuit.
How much does the SuperCool Pedals Thneed cost?
When the second batch opened for pre-order in August 2023, the Thneed was priced at CAD$219, approximately £129, direct from Supercool Pedals. The first batch had already sold out at that point. No US list price has been published in the sources cited here.
Which diodes are in the Thneed?
The Thneed has four selectable pairs of clipping diodes: red LEDs, 1N34A germanium, BAT46 Schottky and 1N4148 silicon. Each pair gives a different drive texture, from amp-like break-up with the LEDs to what Jamie Muir called balls-out distortion from the BAT46 Schottkys.
Sources (9)
- Supercool Pedals The Thneed Overdrive, Pedal of the Day, 2023-08-20
- Has your Klon gone? You might need the Thneed, the “highly customisable, light-to-mid gain overdrive” from Supercool Pedals, MusicRadar, 2023-08-29
- SuperCool Pedals Thneed Klon, Delicious Audio, 2025-05-20
- 11 Best Overdrive Pedals For 2026 (Includes Budget Options), Tone Island, 2026
- Analog Man KLONE mods, Analog Man (analogman.com), 2025
- Builder Profile: Klon's Bill Finnegan, Premier Guitar, 2014-01-21
- The Myth in the Box: Inside the Klon Centaur Phenomenon, gearnews.com, 2026-07-04
- Warren Haynes says this is the greatest distortion pedal, GuitarPlayer (www.guitarplayer.com), 2024-12-12
- Electro-Harmonix Soul Food Overdrive Pedal Review, Performer Mag (performermag.com), 2015-02-05
