Audio tracks

Audio tracks contain digitally sampled sounds. In Audacity, two stereo channels are represented by two stereo tracks. Each audio track has a sample rate: common values include 8000 (telephone), 16000 (speech), 44100 (CD Audio), and 48000 (DAT). (Note that Audacity does not yet support automatic resampling, therefore you shouldn't have a track that's at a different rate than your project's sample rate.

Note tracks

Note tracks display data loaded from a MIDI file. They are currently not editable or playable.

Label tracks

Label tracks can be used to annotate a document and later save these annotations in a text file. To create a Label track, select New Label Track from the Project menu. To add a new label, select some region of your audio using the Selection Tool, and then hit an alphanumeric key on the keyboard. Anything you type will go into the current label. You can use the backspace key to edit the current label.

Press Enter or Return to finish editing a label.
Use the left and right arrow keys to move from one label to another.
To select a label, click on it in the Label track. To remove a label, select it, then use backspace to get rid of it, then press Enter or Return. Alternatively, you can select a range of labels using the Selection Tool and then select Silence from the Edit menu.