I think you're wrong. It only mentions that they used the Xbox's optical outs. All the others are implied to be analog (``analogue inputs only'', etc.).

They just mention that they weren't able to set up the XBox's digital as well as they'd have liked to.

Then again, I'm not sure what they think is being ``dejittered'' by the Meridian equipment. Nor do I know what they were doing with a 7.1 decoder. MP3s are incapable of storing more than two channels.

Actually, it sounds like the might be using that 562 as an ADC. Why you'd want to do that, I have no idea. Maybe they didn't have a high quality analog preamp available.

Maybe you are right. Their fundamental testing ideas are flawed.