Sound Issues post patch 1.19

So if the noise is generated from directly behind you its hardly audible even if there's someone shooting literally inches away.

I found out that its because the game switched audio to 7.1 surround even though I'm using 2.1 actively (have a 7.1 surround headset connected for other uses, i prefer earphones for gaming). 

On the audio settings page in apex "windows audio configuration : 7.1 surround" is greyed out and i cant change it. All was fine before this new update, if anyone knows a fix please let me know

Update: Contacted support and sadly they weren't able to help me, first person asked me to clear cache which didn't work, 2nd just filed it as a bug (transcript attached)
Also https://www.youtube.com/watch?v=5ASYk6CSGWc so you have an idea of what its like ☹️

Update: Found a  "fix" thanks to a comment on the youtube vid.  "Put in "+miles_channels 2" without the quotes into your launch options." For anyone else having this issue.