I'll describe this as best I can: I'm currently running a Sony STR-DH800 receiver, with 5.1 in the front room. The extra 2 speaker outputs are driving zone 2, in the bedroom.Hooked up to the receiver are my PC, HD PJ & BDP, all via HDMI, as well as an older, non-HDMI DVDP, via coax. What I'd like to do, on occasion, is have the ability to play audio from a different source to the video. For instance, I have both the US BD & DVD for The Magnificent Seven; the BD doesn't contain the original mono soundtrack, whereas the DVD does.Obviously, non-inclusion of original audio, frustratingly, happens a lot on releases.Assuming they synch up ok, I'd like some way of playing the HD video with the DVD's mono audio, without going to the trouble of burning some sort of composite disc. Another occasion is when playing a silent film, whether streamed or on disc. Sometimes, they don't have any soundtrack at all & it would be great to play one from another source. Is this in any way possible, without having to have a separate amp & speaker setup in the same room?