I don't know if I'm in the right place but here goes. I have a 990/7075 setup with Orb audio Mod2s (7.1). Iam getting a screech through the speakers when audio formats change from program to program or program to commercial when watch TV. What could be making this happen. It doesn't happen in any other instance. Any help or suggestions would be greatly appreciated. I'm racking my brains here. Thanks in advance.