I want to play DVDs on my PC, routing the audio through an external amp. How do I take the DD 5.1/DTS sound from the DVD to the optical or coaxial input on the amp? All the soudcards I've looked at are not set up to do this. The motherboard has on-board 6 channel audio, and has a 5 pin SPDIF connector which according to the manual is for connecting to external devices. Or am I condemned to not using the amp, and instead hooking up the on-board audio or a soundcard to a set of active speakers?