Welcome Panzerfan,
I understand how frustrating it can be when Windows 11 automatically associates different sound schemes with Light and Dark themes.
To check whether Windows will allow you to switch back to the Light sound scheme:
- Press Windows + R.
- Type mmsys.cpl and press Enter.
- Open the Sounds tab.
- Under Sound Scheme, see if Windows Default is available and apply it.
Could you also confirm your Windows 11 version? Go to Settings > System > About and provide the OS Build number. That will help determine whether you're running a version where Dark/Light sound behavior has changed.
Looking for your update.