I'm having the same issue with 1903 and Realtek (on bluetooth device) I had to revert. Are they aware of this issue? My greatest fear is this will go unnoticed and unfixed. Did you find a way to fix the problem Renwick or were you also forced to revert? Sound completely broken is unacceptable.
I just posted to Renwick. I couldn't revert back to 1809 because 1903 took over my computer and would not revert back. Formatted HD. Back on verison 1809. Miscrosoft 2nd tier tech acknowledged Microsoft is still having issues. Do not install version 1903 if you have Realtek or Creative Lab sound card. Microsoft has big issues which they need to address and fix.