This is purely from racking my brain by going through the band's main discography in chronological order, so it's probably missing a lot of stuff I've researched over the years, but it's a start:

-The killswitch-like effects on the guitar work in Lies Greed Misery are created with a Drawmer Dual Gate, which uses a MIDI cue from Pro Tools to rhythmically cut off the sound of the guitar. This effect was also used on live performances of Points of Authority starting in 2012, to more accurately recreate the chopped-up guitar work on the Hybrid Theory recording.

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