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This is called multi-track recording. It makes it possible to record harmonies with yourself, or add new instruments or vocals to an existing recording. To do this in Audacity, follow these instructions:
- Select the correct recording input that you are plugged into (probably microphone or line-in). On Windows or Linux, select the input in the dropdown menu in Audacity's Mixer Toolbar (on Windows Vista, use the "Recording Device" menu in the Audio I/O tab of Preferences instead). On OS X, Mixer Toolbar may only show "Default Input". If so, select the source on the Audio Devices tab of Apple Audio MIDI Setup.
- Import or record the first track.
- Open the "Audio I/O" tab of Audacity preferences, and check the box labeled Play other tracks while recording new one.
- Close the preferences and press the Record button. If you are recording from a microphone, make sure you use headphones so that the microphone picks up only what you are recording.
See also:
- Why isn't my new track in sync with the previous ones?
- Why can't I hear what I am recording?
- Why doesn't the Mixer Toolbar input selector work properly, for example on Windows Vista?

