I have read 72 pages of the owner's thread to no avail.
I have the Xbox 360 plugged in via HDMI to DVR, Optical plugged into DVR, and the F540 red white plugged into DVR OUT. No sound. I have changed every single setting I can find and it does not work.
Oh, and I have no video now either. It works if the HDMI is plugged directly into the projector from Xbox, but when plugged into the VSX 1021 - no video.