He's a triaxis user as I recall.... but yeah, his rig is insane, and much of it is custom built. Check this out...

Also, from an interview in Guitar World some years ago - not sure if it helps:

Clean setup:

Preamp mode = Rythm 1 yellow
gain = 6
treble = 6.5
middle = 3.5
bass = 3
lead 1 drive = 0
lead 2 drive = 0
master = 5.5
presence = 8
dynamic voice = 7
power amps set on deep and modern


Main Crunch Sound:

preamp mode = lead 1 red
gain = 6
treble = 6
middle = 5
bass = 4.5
lead 2 drive = 0
master = 4
presence = 6.5
power amps set on deep and modern


Lead:

preamp mode = lead 2 yellow (mark 2 lead sound)
gain = 7.5
treble =4.5
middle = 4
bass = 5.5
lead 1 drive = 0
lead 2 drive = 6.5
master = 6
presence = 0
dynamic voice = 3

that goes into a tc electronic 2290 delay. For the lead sound he uses 460 and 602 millisecond delays with about 3 repeats. For the crunch sound he uses a very short 26 ms delay he then uses a lexicon PCM-70 that runs of the loops on the 2290.

And for Mesa tone sucking, the guys there might be on the rectifier end of the spectrum.... maybe using too much gain at a guess... it's why the techs I know call the 'rectifriers'...