The right side of the control center. The 2 silver boxes in the rack are both tube pre-amps, the red box is a "Pod", which allows you to recreate the sound of many different guitar amps from the past. His Mac is clearly under the desk, on top of it is a 250GB La Cie external hard drive. At the bottom of the rack is a black box, standing on it's edge ... that box contains 4 A/D converter cards, which would normally go inside of the Mac, but the slots are apparently all full inside of the Mac, so he uses that firewire device to add more cards.