Worked on my Asus p8z68-v pro gen 3 using optical out to a LG 7.2 channel HTIB and to be honest I can barely tell the difference from the sound blaster z I just purchased so it may be time to return it lol.
I installed the latest drivers/mod and ran into issues when trying to test play back from windows device configuration but testing through the hardware included application I was able to hear sound and in BF3 when there is sound I can turn the player and can confirm the sound switches speakers as spin around. Windows shows I don't have DTS Connect or Dolby Digital Live selected when I know they both can be selected and afterwards I have seemingly true 5.1 surround sound.
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?