yeap, I know them very well. For what I remeber they recorded the album in cubase 4, using a large mixer as summing. Guitars were Dual Rect and 5150 blended with bogner cab (V30 and GT75), as they use 5150 II+ gmajor in their gigs. They use custom 7 strings guitars. Too many tracks were recorded, like 150 in each track, many many guitar/synths layers. There is a studio report in youtube, look for it.