I have submitted a ticket regarding this issue already but will post it in this forum additionally, to get more attention and maybe others will realize this problem also.
Since the latest
… (more)patch (27th September), it is impossible to set the speakers to anything different than 2 speakers.
I used 5.1 before and it worked totally fine, now it just resets to 2 speakers everytime you try to change it.
I have uploaded an example video here: https://www.dropbox.com/s/6029vchzlm9hxqw/speaker configuration bug.mp4?dl=0
Please fix this bug for the sake of immersion 
Thanks (less)
