Jonny Greenwood achieves his signature heavy distortion using the Marshall ShredMaster pedal, as highlighted in a Musicradar feature.

"Thom started using a Shredmaster halfway through the OK Computer Tour, and one was also on his board for shows in support of Kid A and Amnesiac. He had ceased use by Hail To The Thief touring, but had it on his auxiliary board in during the 2008-2009 In Rainbows tour."

He is shown to have the Marshall Shredmaster in his pedalboard

According to the Guitar Geek's 1991 rig diagram, Butcher used the Marshall ShredMaster pedal.

He used it for Song2 for bass distortion part as shown in the music video for Song 2. See timestamp 1:17.

At 39:26 in the YouTube video "The James Dean Bradfield Guitars & Gear Interview", The Pedal Is Shown To Be On His Live Rig

https://www.youtube.com/watch?v=rkaVyg6124c Richie Faulkner of Judas Priest & Elegant Weapons joins us this week in the Marshall factory to run through the new Studio JTM. Boosting his sound with a Shredmaster and bringing some seriously heavy riffs, Richie explains his approach to finding the perfect tone on an amp like the Studio JTM.

We also showed Richie around the Marshall factory, walking him through the Marshall museum, showing him the production process and everything that goes into making our legendary amps.

• Chapters - How Richie Would Use The Studio JTM 00:00 - 00:42 Studio JTM Boosted With A Shredmaster 00:42 - 01:15

In a Premier Guitar Rig Rundown video, Christone "Kingfish" Ingram showcases his use of the Marshall ShredMaster distortion pedal.

In the Tape Notes Podcast at 24:12, Wayne Sermon says that he used the Marshall ShredMaster Pedal for the guitar solo in the song 'Dull Knives'.

This pedal was shown at 5:17

Mr. Vincent Accardi uses the Marshall ShredMaster Guitar Pedal on his pedalboard.

The interview is in german, here's the original sentence:

''Ohne Boxen geht nix. Ohne Klampfe selbst geht auch nix. Am Anfang war´s bei mir aber der Verzerrer. Das war schon ein magisches Instrument! Meinen Bass-Verstärker konnte man nicht zerren. Ich wollte aber so klingen wie Lemmy oder Kronos und da habe ich mir einen Marshall Shredmaster zwischengeschaltet. Damit hab ich dann auch meinen Sound gefunden. Die Tretmine hab ich immer noch, aber benutz sie nicht mehr. Ich hab da jetzt anderes Zeugs. Später hab ich dann mein Motorrad verkauft, und dann haben wir auch nagelneue Marshall-Boxen gekauft. Drei Wochen später wurde uns dann der Proberaum aufgebrochen und alles war wieder weg.''

It roughly translates as:

''Nothing works without boxes. Nothing is possible with just the instrument itself. In the early days it was just me and the instrument. That was already a magic instrument! My bass amp could not be heavily distorted, but I wanted to sound like Lemmy or Cronos. Then I got a Marshall Shredmaster. That's how I found my sound. I still have the pedal but I don't use it anymore. I have other stuff now. Later I sold my moped and then we bought brand new Marshall boxes. Three weeks later the rehearsal room was broken up and everything was gone.''

I guess that was the sound of ''In The Sign of Evil'' and ''Obsessed by Cruelty''. I'm not sure about ''Persecution Mania'': probably not, but it could be.