I have my XBox 360 hooked up to my Pioneer VSX-920-K receiver via HDMI, and my receiver hooked up to my TV via HDMI.
When I set my XBox audio output to Digital Stereo, there is a strange issue where the first second or so of audio does not play. The best way to describe it would be a crappy voice activated recorder that clips off the first part of whatever you say. So if I move through the menus, I don't hear the first sound effect, but I hear subsequent ones as long as they are closely spaced. If I stop and wait a second, then move through again, the first sound again doesn't play. It's as if the audio processor goes to sleep every time sound stops, and takes a second to wake up.
This doesn't happen when setting the output to Dolby Digital, so normally I wouldn't care. However, the XBox seems to like to use regular stereo for some videos, even with Dolby Digital selected, and I see the same issue when it does.
If I hook the XBox straight to the TV via HDMI, the problem does not exist.
Any one else experience this?