Ahah! MArketing 101, they lie, sorta.
It is a 7.1 RECEIVER, it is not a 7.1 amplifier. It only works as a 5.1 amplifier.
Sorry man, I feel for you. I've been ****ed over to the tune of about $600 over the last 3 months with misleading advertising.
On the bright side you probably don't need the I/O console for the X-Fi, just an adapter cable to split their mutli signal analog into the right configuration for the Panasonic.
These are the kinds of cables you will need to feed a 7.1 amplifier.
http://www.allelectronics.com/cgi-bin/item/CB-219/940/6"
You can use the same for 5.1 audio. Some of the RCA plugs just won't have a hole.
Here are the X-FI jacks that need need some kind of splitter cable. The two above the digital connector:
-Line Out 3 jack Connect the following inputs on powered analog speakers or a home theater receiver to this jack:
On 5.1 systems: Front Center and Subwoofer
On 6.1 systems: Front Center, Subwoofer and Rear Center
On 7.1 systems: Front Center, Subwoofer and Side Left
-Line Out 2 jack Connect the following inputs on powered analog speakers or a home theater receiver to this jack:
On 4.1, 5.1 and 6.1 systems: Rear Left and Rear Right
On 7.1 systems: Rear Left, Rear Right and Side Right