I have had a Panasonic sa-pt673 DVD player/surround sound system for quite a while now, but have never been able to get the surround sound working for anything except playing DVDs. Not for satellite TV, or for my xBox 360. I have my xBox (and Wii), as well as my blu ray player hooked up to an input selector box, and then the box hooked up to my TV. The DVD player is also hooked up to the TV. The TV then has an optic audio cable going from the TV to the DVD player (for the surround sound). However, the surround sound still won't work for anything but DVDs. Any suggestions as to what I'm doing wrong?