I've been able to duplicate that sound perfectly....but then again...equipment does help.

My rig:

Mesa Boogie Triaxis
Rocktron Intellifex
DOD 32 stereo Eq
Mesa Boogie Stereo Simul-Class 2:Ninety Power Amp
2 4 X 12 Boogie Rectifier Bottom Cabs (With the Armor Plating)
(plus other equipment I've listed somewhere on this site)

Pluss I use EMG's in my Gitars.

You can have the technique down, but to get the exact sound, your rigs gotta comapare to what the pros are using.

I'm seriously thinking of selling my Rocktron and going back to an ADA Mp1. I'm also saving up for the Eventide DSP 7000 Ultra Harmonizer wich hopefully I'll have by christmas or shortly after (Damned bills)