3.1 "surround" not being properly used.

Hello! I’m having an issue where the engine/editor doesn’t know how to make use of a 3.1 setup.

It’s a left, centre, right and sub speaker.
This setup is classified as “surround” by windows, but has the rear speakers disabled. This allows for the placement of the speakers to be used properly to simulate surround.

However, I’ve found that in UE4, sounds that come from behind the camera get muted as if it’s expecting rear speakers, despite them not existing in the windows audio manager.

I also noticed this message repeatedly when I tried to build the project:

It clearly references rear speakers.