I have had my floor pod plus for around a year now and have been playing almost only metal on it. I have put up with this squealing up until now but now that i have started a band i can't afford for this sqealing to happen during a show. I use the high gain line 6 insane amp on the pod and when nothing is playing a high pitched squeal takes over the sound in the room. the only way to control it is to physically turn off the pod, or turn off the volume, but when i turn it back up it keeps squealing. I am definite it isn't feedback because i have been using my headphones in it and it still squeals. Is it the amp model? Or is it there a defect in my pod?