Right-click the volume icon on your taskbar and select Sound Settings . Go to > Recording tab.

Right-click an empty area, select , and if Stereo Mix appears, right-click to Enable it.

Unlike Windows, macOS does not have a native "Stereo Mix" feature for internal audio recording. You'll need a "virtual cable" to bridge the gap. How to Record Internal Audio on Mac? - Apple Community

Windows offers built-in ways to reroute its own output as an input.

Choose your primary output device (e.g., Speakers) followed by as the recording device. This captures exactly what you hear. 2. Mac: Virtual Audio Drivers

Once enabled, any recording app like the Windows Sound Recorder can use it as the "Microphone" source.

: If Stereo Mix isn't available, Audacity (a free, open-source tool) uses a host called Windows WASAPI . In Audacity, set the Audio Host to Windows WASAPI .

: This is a virtual recording device provided by your sound drivers.