The Indigo Sludge Preamp + Fuzz is a guitar pedal combining a high-gain preamp with a fuzz circuit and an octave switch, built around the tones Korn captured at the Indigo Ranch sessions in the mid-'90s. It was sold exclusively through Korn's website as a limited run of 500 units priced at $250, and sold out within two days of the band posting about it on their Instagram1.
What it does
The preamp section is modeled on the high-gain preamp stages from the Indigo rigs, which Guitar World describes as delivering the tight, saturated crunch that defined Munky and Head's seven-string riffs. The fuzz side offers what the band calls "the same preamp roar and fuzzed chaos" of the Indigo Ranch sessions, with a woolly, sustain-drenched character1.
An Octave switch is included to bring what Guitar World describes as gut-rattling depth1.
"This isn't 'inspired by' Korn's tone. It's built on the same ingredients that forged it," the band says.1
The limited run
The pedal was a strictly limited release: only 500 of the $250 pedals were made, sold exclusively through Korn's website, and they sold out within two days of the band posting about it on their Instagram1.
The Indigo Sludge Preamp + Fuzz is sold out. A related limited-edition pedal, Brian "Head" Welch's version of the Indigo Sludge built with Distortion Inc, was announced for pre-order in May 2026 after all 500 of Munky's $250 Indigo Sludge pedals had sold out2.
Videos
Oz
Taylor Danley 2: Maximum Chungus and Taylor Danley
Questions
Is the Indigo Sludge Preamp + Fuzz true bypass?
Yes. Guitar World reports that the pedal offers true bypass alongside 9V power, which the publication describes as making for easy pedalboard integration. True bypass means the pedal's circuit is removed from the signal path entirely when it is switched off, so it should not colour your clean tone when not in use.
How much did the Indigo Sludge Preamp + Fuzz cost?
The pedal was priced at $250 when it was announced in October 2025. Only 500 units were made, and Guitar World reported that the run sold out within two days of the band posting about it on their Instagram, so the pedal is no longer available at that price through normal retail.
How many Indigo Sludge Preamp + Fuzz pedals were made?
500 units were made, according to Guitar World. The limited run sold out within two days of Korn posting about the pedal on their Instagram, making it a strictly limited edition release.
What voltage does the Indigo Sludge Preamp + Fuzz use?
The pedal runs on 9V power, as reported by Guitar World, which the publication noted makes for easy pedalboard integration alongside its true bypass switching.
Sources (2)
- Indigo Sludge Preamp pedal recreates Korn's guitar tone, Guitar World, 2025-10-27
- Korn drops pedal that channels genre-defining debut record tone, Guitar World, 2026-05-29
