Korn – Korn

at 1:20, he states that he uses the big muff pedal in the studio

Further, on : https://www.guitarworld.com/gw-archive/seven-string-summit-korns-munky-and-incubus-mike-einziger-worship-feet-steve-vai

quote SHAFFER: We had problems with mud in the studio while we were doing our first record [Korn (Immortal/Epic)] because we tune down and use a lot of gain. When you have two guitars that sound like that, it becomes too much. We tried to get rid of the mud by bringing in a Big Muff pedal that we turned all the way up, as that usually compresses the frequency response and tightens up the sound. The Big Muff actually made it sound even more muddy, but it also created this really cool texture, so we decided to take what initially appeared to be a problem and incorporate in into our music.

Este pedal fue usado por Munky desde el primer album de Korn hasta la actualidad, ya que el en una entrevista para Ibanez dice que Ross Robinson le presento el pedal y el quedo encantado con este. En los albumes Korn, Life is Peachy y Follow The Leader este pedal lo usaba directamente en su pedalboard y en los siguientes albumes lo mas probable es que este pedal lo haya usado como un preamp o solamente para grabar en el estudio. en el minuto 11:05 se ve el pedal.

This pedal has been in use since Korn’s debut album and remained a key part of Munky’s setup for many years. It has been used on songs like Fake, Lost, Swallow, Good God, No Place to Hide, A.D.I.D.A.S, Ass Itch, Kill You, It's On!, B.B.K, My Gift to You, Somebody Someone, Did My Time, and more. This is the oldest pedal in Munky’s pedalboard, consistently used since the Korn album. However, it was no longer present in The Serenity of Suffering era, as it was missing in his most recent Rig Rundown. The pedal can be seen clearly at the 11:05 mark.

Ross Robinson has confirmed that they used an original Electric Mistress on the first 2 albums.

Used by Munky in the mid-1990's, but it is unknown on which song he used it.

Head apparently used this guitar during the recording sessions of the self-titled Korn album.

Brian Welch is confirmed to use the Electro-Harmonix Deluxe Electric Mistress V1 flanger effects pedal, as evidenced in the "KoRn TV - Complete Web Series" on YouTube, specifically in a video by thekornreeper. In this series, Welch can be seen using this vintage gear in the studio during the creation of the band's first three records.