[WormholeXtreme]

I finally found the post from amirm in relation to multichannel pcm and HDMI with the Elite and HD DVD.

Originally Posted by amirm at AVS

Yes, HDMI 1.2 allows uncompressed PCM. But the 360 data path to that bridge is not wide enough to support it.

HDMI will work with your new receiver by the way. You will be able to select DTS at 1.5 mbit/sec which should sound pretty good although no better than optical out.