I can't get Dolby Digital Surround sound to work when running it optical through my Dolby Digital 5.1 Prologic 2 and DTS Pioneer Reciever. I set the speakers to 5.1 and have the latest drivers. I tried using the soundback utility from Realteks site but it doesn't give Dolby Digital just says digital unlike if I use it with some other older game such as Star Wars:Knights of the Old Republic II. Help Please.