Can I transcode the WMA Pro soundtrack to DD, so I can run it through my AVR?
Yes you can. The first option is if you have an nForce2 motherboard with SoundStorm you can set it to transcode the WMA Pro 5.1 to DD over SPDIF. This is limited due to the number of people who have (rather don’t have) nForce2 motherboards with SoundStorm. The second option will work for most others. Using the AC3 Filter (Currently in beta) from Sourceforge.net you can do this. Please see http://www.avsforum.com/avs-vb/showthread.php?postid=3820212 for more information and help with this.