I fixed this annoying issue, the audio station dial could be pressed down and mute/unmute the specific speak you had selected to configure. I went round and unmuted all the speakers that weren't working when I had the 7.1 surround on and the problem was solved.
I recently purchased the Asus STRIX 7.1 surround sound gaming headset (https://www.asus.com/Headphones-Headsets/STRIX_71/)
The headset comes with a audio station where can select various things such as whether it's on 7.1 surround or not (The problem). When I have the 7.1 surround sound on...