Found in the 2018-11-13 white list update.
On my system the audio is crackling under Proton 3.16-4 (selected by Valve testing), the problem goes away if I force the game to use Proton 4.2-7
Hello @coltondrg, please open a new issue report with your system information included.
proton 3.16-4x1 2019-06proton 4.2-7x1 2019-06
Whitelist Request
System Information
I confirm:
Playbutton in the Steam client is sufficient.are necessary to run the game.
Issues
remaining issues: