I need a USB soundcard that can pass digital 5.1 signals from movies to my DTS/DD reciever via SPDIF under Vista. I does not need to decode them, just pass them through.

The UA-4FX's information page says that it supports said feature, but that page was obviously made pre-Vista. Now, Vista drivers are available, but there is no info wheather these drivers support SPDIF.
I already bought a M-Audio Transit which supports SPDIF on XP, but lacks it on Vista.

Anyone have expirience with the UA-4FX and Vista?