how can I make Audacity record both Mic (input) and Headphone (output) audio?

[doctorXYZ]

Hello,
With a click of the record button in Audacity, I can record all the sounds that enter my microphone (my voice). But Audacity is not recording the other person's voice (earphone/headphone). How can I make that happen?

[sandyd]

I think you have to record one track at a time.

Do something like this.

- Open the output audio mp3 (assuming it is an audio file, flac, and others work as well) in audacity

- Add a new track

- Record the mic to a new track.