I was trying to troubleshoot the audio syncing properly. When I hook up the Tivo HD with HDMI to my tv it work great. All in sync when I listen to the TV speakers. If I also have the Optical out going to my Receiver it will sometimes be a lot and sometimes a little "out of sync" Someone suggested just taking the optical out of the TV and going to my reciever, but now it does not decode as Dolby Digital. Just Pro Logic.. Maybe my TV doesnt pass the D.D. thru the optical out? Looked for settings, TV, and TivoHD, but tv doesnt have anything, and TivoHD is set to Dolby Digital. Thanks. Need to read thread at AVS about synching, maybe that will have some thoughts. I like D.D. better, seems to make the Sub Woofer stand out.