How to record audio on Audacity either from a microphone or to capture the sounds of another program

To record on Audacity, you simply need to set up your microphone, add a track, and press the "Record" button ...
Ars Technica

Line In only playing/recording on Left side (Sound Blaster Z series)

OK, first of all, this exact same setup worked fine with the Realtek on-board Line In. Unfortunately that broke, so I replaced it with the Sound Blaster Z. Basically the setup is a Guitar into a Line ...