I have been using Audacity without problems for may years. However now my recordings (from internet sources), whilst apparently recording ok (waveform looks normal), the playback sounds like it was recorded in a bucket at the end of a pipe.
I have not knowingly changed anything on settings. I have uninstalled Audacity and re-installed but the problem persists.
If you click on the Recording device and Playback device settings, I expect they will say “Microsoft Sound Mapper - Input” and “Microsoft Sound Mapper - Output”.
“Microsoft Sound Mapper” is not a real device. It is an alias for whatever is set as the default device in the Windows Sound control panel. Windows can change the default device for many reasons, without the user being aware that it has changed.
Is there an option in the Device Toolbar Recording device setting for “Stereo Mix” (or something similar to that)? If so, try selecting that as the recording device.
Perhaps there was a Windows update.
“Stereo Mix” is a very old technology that has been gradually replaced since the introduction of WASAPI with Windows Vista.