man, what a great video......
but, Barber Electronics got the jump on vai, with the double pedal thing:
The Dual Discrete is a custom pedal that TPNgear (Bob) can order from B-Custom (the Barber custom shop), you pick two of our "three knob" overdrives and they are built by Ronni in your choice of black, blue or red enclosures with knob choices of black, blue, white, cream, red, grey, you can even mix knob colors on a unit. Drives to pick from are DD LG,DD SS, LTD, LTD SR, and Tone Pump. The enclosure measures 3.7" wide x 5.7" long x 1.77" tall. The package saves space on the width of your pedalboard, eliminates a patch cable, and in most cases adds internal trims, such as; DD SS, DD LG, LTD and LTD SR get internal midrange control.
check out the info here:
http://www.tpngear.com/forum/index.php?s=d95c121af7cc7af695305e11732ee47e&showtopic=1309