Hi t88powered, I have the same mainboard as you: ASUS P8Z68-V PRO GEN3. I installed the R2.71 office first, then replace the RTKVHD64.sys then reboot with disabling driver signing enforcement. I saw the RealTek HD Audio Manager but look quite different with other fellow (ASUS specific?). And I don't have "Speaker" tab, "Speaker Configuration", "Dolby Home Theater" section. Did I missed anything? I see the screen of other people like this: But my control panel is: Did I miss anything? If I select DDL 5.1 in "Default Format" of "Digital Output (Optical)", then I will get DDL output from optical in gaming? Many thanks!