How to capture the system sound output, but not the microphone?

Windows

Idea copied from here.

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On the volume tray icon, right click and select "Recording Devices"

Be sure that disabled devices are listed. Tick "Show Disabled Devices"

You may have a device called "Stereo Mix" , "What U Hear" or "Rec. Playback". Enable the device if it is disabled. Now check that is listed in $AudioInputDevices, and notice the position of the device in the list.

TableForm[$AudioInputDevices, TableHeadings -> Automatic]

Now you can specify the device using AudioInputDevice

AudioCapture[
 "test.ogg"
 , AudioInputDevice -> $AudioInputDevices[[2]] 
 , Appearance -> "Detailed"
 , SampleRate -> Automatic
 ]