I had a lot of Windows updates installed today but it did not help my Win 11 audio issue (which is an annoying, period, distortion or loud scratching sound in audio playback.)
Oddly enough, I went to System > Sound >Properties > Output Settings > Format
selected "16 bit, 8000Hz (Telephone Quality)" and the issue vanished!
BUT when I selected either of the other two options ("Tape Recorder\DVD Quality") the problem reappeared.