So up until recently, whenever I wanted to listen to music, play games, etc. the volume would output through every one of my speakers. Recently, this stopped, and as of right now, sound only comes out of the front R and L speakers, as well as the sub. I don't remember ever updating the sound driver before this incident occurred. My situation is relatively similar to this http
/ (which appears to never have been resolved), except my setup has an MSI mobo and it's a 5.1 stereo setup
My MB is a MSI Z97-GAMING 5 ATX with on board sound, and the sound driver is the Realtek HD audio driver. The sound manager UI is set to 5.1 http
/, and in playback devices the speakers are also configured to 5.1.
So far in attempts to resolve this, I've tried maximizing the volume for the rear and center speaker, which failed to resolve the issue. After some research, I tried to enable the "Speaker Fill" option, but it is missing from speaker properties http
/. To get it to appear, I tried uninstalling the sound driver, and then installing multiple older versions of it with no avail.
Just as a precautionary measure, I know that most music isn't recorded in a, for lack of a better term, "5.1 way". However, music was outputting through every speaker up until a day or two ago.
I appreciate your help and thank you for your time.
EDIT: Forgot to mention, when testing all the speakers in configuration, they all work. It's only when trying to listen to music or watch a video etc. that they don't work.

My MB is a MSI Z97-GAMING 5 ATX with on board sound, and the sound driver is the Realtek HD audio driver. The sound manager UI is set to 5.1 http

So far in attempts to resolve this, I've tried maximizing the volume for the rear and center speaker, which failed to resolve the issue. After some research, I tried to enable the "Speaker Fill" option, but it is missing from speaker properties http

Just as a precautionary measure, I know that most music isn't recorded in a, for lack of a better term, "5.1 way". However, music was outputting through every speaker up until a day or two ago.
I appreciate your help and thank you for your time.
EDIT: Forgot to mention, when testing all the speakers in configuration, they all work. It's only when trying to listen to music or watch a video etc. that they don't work.