What amp settings do you need for Slipknot?
It depends on the song. On a generic five-knob amp, Psychosocial starts at Gain 7, Bass 4, Middle 5, Treble 6, Presence 5, Reverb 2; Duality starts at Gain 7, Bass 4, Middle 5, Treble 6, Presence 5, Reverb 2. These are starting points, not the settings used on the records.
What gear did Slipknot use on these songs?
Psychosocial: Fender Jim Root Telecaster prototype, drop B; Orange Rockerverb 100 blended with a Diezel Herbert. Duality: Drop B tuning, guitar not documented; VHT Pitbull head, Carvin 4x12. Each song page lists the sources behind its rig.
Can you get the Slipknot tone without the original gear?
Yes. What carries these sounds is the gain structure, the EQ curve, the pickup position and the order of the effects, and all four can be rebuilt on other equipment. Tonelify rewrites each starting point for the amp and guitar you own.