Hi Alex, welcome on board. Feel free to check out the Studio section for more music geekery.
As Don says, the sound is mainly in the fx. You might also want to get yourself over to Dubsounds.com on their forum - 1 of the guys there is in touch with Billy now and again and I remember him posting something about this there not long ago. They're all gear geeks with similar taste so you should find stuff of interest there.