Ah, I do believe resampling would destroy that encoding, and in fact, I bet it won't pass anything (as the UA-5 would have to have DD/DTS Decoders in place to resample). Drat.
The reason I asked is, of course, I already own a UA-5. More cost-effective than buying another box
I did find a emi 2|6 for $99 a few weeks ago (Sam Ash is clearancing their stock), I am pretty sure that one would work, *if* I can use it as a soundcard in iDVD. I dunno, I haven't had an emi 2|6 in house for a few years, and all I used it for was a wintel box.