shredi knight
Power User
Someone posted this on the Petrucci forum. It's Petrucci warming up backstage and you can see his Axe FX in his rig from 0:28-0:35 (there appears to be an instrument cable plugged into the front of it):
http://www.youtube.com/watch?v=DpjIxNeLedA&fmt=18
http://www.youtube.com/watch?v=DpjIxNeLedA&fmt=18