Audacity and GarageBand '09 Similarities

Both Audacity and GarageBand '09 allow users to...
 
 - Record
       ~ using microphone, line input, or other sources
       ~ create multi-track recordings
       ~ create podcasts, loops, and sound recordings
 
 - Edit
        ~ users can cut, copy, paste, and delete audio tracks
        ~ edit and mix unlimited amount of tracks
        ~ monitor volume on individual tracks
        ~ can undo and redo changes made to tracks
        ~ can mute and play solo individual tracks
 
 - Add Effects
        ~ change the pitch of tracks
        ~ built-in phaser, wahwah, and echo
 
 - Import and Export Data
       ~ can import and export as WAV and MP3


(Audacity: Free Audio Editor and Recorder, 2009; GarageBand '09, 2009)