Hello, I am confused about how channels on television are processed by my processor. I first want to say I have Comcast Cable HD. When watchind TV sometimes the channel I am watching will say it is DD5.1 on the TV screen but it will only come through my front L and R speaker then on other channels it will come through all my speakers in a 5.1 setup. Other channels might say they are DD but only come through L F C speakers. Does this all depend on hoiw the channel is broadcast. Thanks