BlackHole Audio Loopback Driver -
BlackHole is a modern macOS virtual audio driver that allows applications to pass audio to other applications with zero additional latency.
                
                

You can use Sound Recorder to record, mix, play, and edit sounds. You can also link sounds to or insert sounds into a document.
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You can use Sound Recorder to record, mix, play, and edit sounds. You can also link sounds to or insert sounds into a document.
Read also http://en.wikipedia.org/wiki/Sound_Recorder_%28Windows%29