The Thneed is a light-to-mid gain overdrive from Supercool Pedals, a Canadian builder whose pedals are designed and assembled in Canada. It takes its starting point from the Klon Centaur, the pedal that set the template for transparent overdrive, but it is not a straight copy: it adds selectable clipping diodes, a bass toggle and internal gain modes, and it drops some of the original's circuitry along the way123.
Pedal of the Day introduced it in August 2023 as "a low-mid gain drive" and described its sound as "a signature smooth and bright tone that cuts through the mix"1. MusicRadar, covering the announcement, called it a "highly customisable, light-to-mid gain overdrive" inspired by the Klon Centaur2. Delicious Audio's Paolo De Gregorio summed up the design this way:
"The Thneed is a thoughtful and streamlined take on the classic transparent overdrive circuit" that captures the character and tone of the original.
Where it sits next to the Klon Centaur
The Klon Centaur is the reference point for this kind of pedal. In a Guitar World history of boost pedals, Huw Price noted that "some overdrive pedals produce excellent results when used to boost," naming the Klon Centaur among the classic examples4. The Thneed follows that tradition. Guitar World has described it as "a Klon Centaur-esque" overdrive5, and Delicious Audio calls it "a Canadian evolution of the Klon Centaur circuit"3.
Two departures matter to players comparing it with Klon-style pedals:
- No charge pump. Pedal of the Day notes the Thneed "does away with frivolities like a troublesome charge pump and multiple op amp stages, and instead opts for a more reliable design"1.
- Selectable clipping. Instead of one fixed clipping arrangement, it offers four selectable pairs of clipping diodes for varied drive textures3.
Controls and internal settings
| Control | What it does |
|---|---|
| Level | Controls the overall output of the pedal; can be set up to boost a guitar amp into overdrive2 |
| Unless | A face-forward bass toggle; it works on the bass in the op-amp feedback loop, affecting low-end handling and adding op-amp drive when activated2 |
| Clipping selector | Four pairs of selectable clipping diodes: LED, 1N34A, BAT46 and 1N4148, for a wide range of drive sounds1 |
| Internal gain modes | Internally selectable gain modes13 |
The Unless switch is the pedal's most talked-about control. MusicRadar described it as "kind of like a fun gain wild card switch," because engaging it changes how the pedal handles the low end and pushes the op-amp harder2.
The clipping diode types are worth knowing when dialling in sounds: LED, germanium (1N34A), BAT46 and silicon (1N4148) each clip differently, which is why Supercool made them switchable rather than fixed1.
Bypass
The Thneed offers a choice between true bypass and buffered bypass13. That matters on larger boards: a buffer can help preserve your tone over long cable runs, while true bypass keeps the pedal's circuitry entirely out of the chain when off.
What reviewers said
Pedal of the Day's verdict was that the Thneed is "a highly dynamic and customizable drive pedal," adding: "Not only will it improve your tone and overall sound, it will pop right off of your pedalboard for all to see"1.
The name, for the record, comes from Dr. Seuss: Delicious Audio notes it is "a Dr. Seuss-coined term signifying 'a fine something that all people need'"3.
Videos
Supercool Pedals
Pedal of the Day and Supercool Pedals
PedaiseEfeitos
Questions
Is the Supercool Thneed a Klon clone?
It is based on the Klon Centaur circuit, but reviewers describe it as an evolution rather than a straight copy. Delicious Audio's Paolo De Gregorio called it a Canadian evolution of the Klon Centaur circuit, and Guitar World has described it as Klon Centaur-esque. Pedal of the Day framed it as a no-nonsense take on the legendary transparent overdrive pedal, with changes such as selectable clipping diodes and the removal of the charge pump.
What does the Unless switch do?
Unless is a face-forward bass toggle. According to MusicRadar, it works on the bass in the op-amp feedback loop, so it affects how the pedal handles low end and adds op-amp drive when activated. MusicRadar's write-up described it as kind of like a fun gain wild card switch.
Which clipping diodes does the Thneed offer?
The Thneed has four selectable pairs of clipping diodes: LED, 1N34A, BAT46 and 1N4148. Pedal of the Day says the selection gives a wide range of drive sounds, and Delicious Audio notes the four pairs are there for varied drive textures.
Does the Thneed have true bypass or buffered bypass?
Both. The pedal offers a choice between true bypass and buffered bypass, according to both Pedal of the Day and Delicious Audio, so you can set it up to suit the rest of your board.
Who designed the Supercool Thneed?
The Thneed was designed by Jamie Muir of Supercool Pedals, who discussed the pedal in a video accompanying MusicRadar's 2023 announcement of the pedal.
Does the Thneed use a charge pump?
No. Pedal of the Day's review notes that the Thneed does away with a charge pump and multiple op amp stages, opting instead for what the reviewer called a more reliable design.
Sources (5)
- 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
- Boost pedals: the history of the stompbox that supercharged the sound of rock 'n' roll, Guitar World, 2023-07-26
- Supercool Pedals' Barstow Bat puts a new spin on ProCo's Rat, Guitar World, 2024-11-06
