I was curious as to whether anyone has gotten their hands on the new audio-only cable that comes with the HDMI cable. I don't have 50 bucks to spare to buy the package, but I do have an old Mad Catz Universal RCA/S-Video cable that I've been trying to mod so that it only pulls audio (if you plug it in normally, the 360 detects it AND the HDMI cable... gets confused... and doesn't output video)
I've got it to the point that it doesn't kill the video, but for some reason, it doesn't output audio either. All the pinouts I've been able to find are all rgb to vga (google likes to ignore when I add "-rgb -vga" to the query) and nothing tells me how the 360 determines which output to use (like when switching from Composite to Component on the standard included cable) I know there's a switch, but I've already cracked one cable, and I don't want to crack my remaining cable.