Hi everyone, HTPC newb here who'd greatly appreciate some help regarding audio. I have a Turtle Beach Santa Cruz sound card and would like to connect it to my Yamaha HTR-5550 receiver to experience the receiver's Dolby Digital and DTS sound to watch movies. Problem though is that I can only get the receiver to play in Dolby Prologic II mode. The only way I can get the sound from the receiver to work is by connecting a 1/8" mini stereo jack with RCA connectors. I plug in the 1/8" jack into the card's speaker output and the RCA connectors into the DVD audio input of the receiver. It's my understanding that the cable connection between the PC and receiver must be digital in order to get DTS and Dolby digital sound to work. So I plugged in the same cable to the VersaJack port on the Santa Cruz card. I went into the Santa Cruz control panel and changed the VersaJack setting to Digital Out. I left the RCA connectors on the opposite end of the cable plugged into the DVD audio RCA inputs but no sound comes out which is my objective. I even installed WinDVD Platinum and went into Setup, Audio tab and selected 'Digital (S/PDIF) out to External Processor.' I feel like I'm missing something but just can't figure out what it is. Could it be something that I need to install additionally to my sound card? Could be something regarding SPDIF? Please provide any suggestions. Thanks.