Thanks for your reports! We’re seeing reports of this after the Windows 10 update recently after the KB4515384 update and we’re gathering information for the muffled/broken sound.
Could all impacted provide the Windows version to see if this is happening on other Windows builds? Press Windows Key + R and type in winver, provide the current Windows version including the OS build like so: Version 1903 (OS Build 18362.356).
If spatial sound is on, does it help to disable this? Right click on the sound icon on the Task Bar, go to Spatial Sound and make sure it’s turn off.