Recently I Tried my Brother's headphones (Corsair). I didn't like them over my Delta S and when I returned to my Delta S the Virtual Surround Sound was no longer working, only the front left and right channels were engaged drastically lowering the Audio Quality. When trying my brother's headphones I did install Dolby Access and Enable Dolby Atmos, however, I uninstalled it like another post suggested, and this did not work. it has been like this for about 2 days and I am desperate to get the sound quality I had before.
Any help is appreciated.
I have the ROG Delta S Animate and with Virtual Surround Sound turned on, it only shows LF and RF so this seems to be normal.
It's possible when you installed Dolby Atmos and uninstalled it, it changed some windows settings and didn't revert them.
Since your volume went lower, one setting I suspect that's turned on is Spatial Sound, check to see it's turned off.