Hi,
You need
Realtek Audio Drivers (HDA - ASUS ROG/PRIME/TUF MB) from this
drivers thread. Follow scrupulously your INSTALL process with cleanup step, for the next drivers packages that I would release, you will can directly follow the UPDATE process.
Note (in order to choose correctly the install/update process to use) : You have a
ASUS ROG SS1 motherboard.
Also, here is a official description of what functions SS2 have :
https://www.asus.com/support/FAQ/1033006/The configuration of the audio channels (Stereo, 5.1, etc.) is done via Realtek HD Audio Manager/SupremeFX (via tray icon or via Control Panel).
The configuration of the Surround/Upmix is done via Sonic Studio II.