[2023] EU4 sound stuttering / reverberating

Please uninstall the RTKVHD64.sys audio driver then reboot.

Windows will detect the hardware with no driver. Accept that , let it install, then reboot again.

Does that help?  

That usually does help with such issues ... did it install that same driver

Driver Version: 6.0.9231.1 (English)
Date and Size: 2021-08-30 7:00:00 PM, 6513704 bytes

or something older or newer?

You're not running any video capture or streaming software are you? If so try unloading that.  

That's a shame; I'm pretty sure if you install a different driver version that will help.

I know the RealTek support site is a nightmare to navigate, but can you try to get a later driver installed from there please?