I've recently bought the DCS 313 and am very pleased with it. A very powerful system and good picture quality. So what I decided to do next was to connect my Panasonic Sky box to the 313 using a RCA audio cable. But I get nothing. No sound. Am I missing something? What I was trying to do was to get the sound from the Sky box through my surround speakers whilst watching Sky. Has anyone had this problem or got any thoughts? Thanks.