I have heard too many mixed messages from BB...I need some help understanding zone b with a 7.2 receiver. Someone told me you could only have 5.1 or 5.2 set up in your main room and channels 6 & 7 were for zone b. I had someone else explain you could have 7.1 or 7.2 set up in your main room with 2 more speakers set up under zone b. Do I need a separate source for zone b such as a cd player, and why? Will I be able to have music in the house and on the pack patio at the same time, same music? Your expertise is much appreciated in understanding this topic, thank you.