RodneyVikens This guy:
The Thumb! Previous band guitarists worshipped Tobin Abasi - he's a beast. Not that I think it's all that listenable...I do dig many of the grooves but the prog side of things gets a bit weird for me.
But getting that super low, yet distinct grind tone that works for both rhythm and leads...yeah, he's probably spent as much time dialing in his rig as he has getting his hands to work like that. Our 2 guitarists had two approaches, one ran a pedalboard into a beastly laney 2x12 and let the amp do most of the work with a light eq and boost pedal setup.
The other had a Peavey 6150+ and 4x12 with pedalboard which never quite worked for me...either muddy rhythms or overly shrill leads.
Eventually, he worked out how to get a Boss GT-10 to play nicely with his amp in a 'four cable method' - that worked for what he was doing. Not sure if how he setup his patches on the GT-10 or where most of his gain was coming from - just glad my ears didn't bleed as much during rehearsals (live was another story though).