Evening gents, I'm after some help before my new PC goes out of the window!! This evening after work I've connected up my old Sony surround sound system (no HDMI) to my new PC (windows 8.1) via SPDIF, but no matter what I do I can't get it working in any program and it's doing my nut in now! I have an ASUS Z97 Pro Gamer motherboard and am running the SPDIF into that. If I go into "sound" via the control panel and select the "Realtek Digital Output (Optical)" I can make it the default, but the configure option is greyed out. I can go into properties and under the "supported formats" tab dolby digital and DTS are both ticked and if I highlight one and then click test I can hear sound out of every speaker and the subwoofer. Happy days. The problem is that whatever program, game, dvd, etc I use, the sound just comes out as 2 channel PCM. I've googled my arse off and checked every option, but can't get anything to play in 5.1. In the properties if I go to the "Advanced" tab there's a rake of options, but they're all only 2 channel. Realtek Audio Manager doesn't give me the "speakers" tab I've had on previous PC's to change from 2.0 to 5.1. I even hooked up and old Soundblaster external card that I used to use on a HTPC, but no joy with that either. I understand that SPDIF can only handle two channels of uncompressed data, but can't seem to get mine to passthrough DD and DTS via SPDIF. Is there something I have to change in the BIOS? I'm totally out of ideas now. Any help would be REALLY appreciated.