i guess he uses tons of stuff in the studio. i'll tell you what he used recently in a clinic (6 feet away from me!)
ibanez pgm 800 (the natural finish ash model)
ibanez seven string (hardtail custom, like a purple rg7621 with the obvious painted f holes)
ibanez tonelok tubescreamer
boss chorus (ce? teh light blue one)
laney GH100L half stack
and an incredible pair of hands wonderfully coordinated by his brain!
he had the laney on a light crunch sound, lowering the volume on the guitar for clean, and using de TS for distortion.
hope that helps.
PS: i really want a laney!