You guys that are comparing Vai to Gilmour for a "processed" sound. You do realize that Gilmour's pedal board and rack setup makes Vai's setup look tiny right? David Gilmour is one of my favorite players, but his tone is anything but unprocessed. His pedal board dwarfs Vai's board and his rack is closer to Petrucci's in size. Last I read, Vai was using an Eventide Harmonizer and an AxeFXII for his effects chain. Then he's got a midi switcher, his wah, volume, and custom Ibanez OD on his board. Gilmour has a whole rack full of stuff and something like 15 different pedals on his board.