Earlier today, I was setting up my gear for an audition with my band for a slot in a big local gig, coming up pretty soon. Well I had everything all wired up, which really isnt much for me since I try to keep it simple, but when I went to test my distortion (Ibanez PD-7), as soon as I turned it on I got the most horrible feedback. Its not closer to my mic or amp than it normally is at practice, and all of the cables are the same. What could be to blame for this nasty feedback? Someone please help.