VTB General FAQs - FAQs
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S/PDIF Optical Digital In: What is it meant for? 
The Optical Digital Input is meant for recording digital-to-digital from other
music players (MiniDisc, DAT, CD, DVD, etc.) that have an Optical Digital 
Output. To listen to the audio you must first record it to a file on your hard
drive. 

Please note that Dolby Digital or DTS-encoded audio data coming in through the
Optical Digital Input cannot be decoded by the soundcard. As far as we know, 
there is no software that can do this, either. 
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