I have a Sony STR-DE475 5.1 Amp and a Panasonic DMR-EX83 DVD/harddrive connected with a optical cable and have a sync problem. The DVD is connected to the TV via HDMI, when the sound is played through the tv the sync is ok but when played through the 5.1 amp it is about 1/2 second out of sync. I can connect the TV to the amp through the optical cable the sync is ok but there is not a 5.1 signal. The previous DVD player was connected to the amp using a coaxial cable and it was fine. Any ideas. Thanks.