Try the Soundbooth beta now. The prerelease of the next version of Soundbooth provides new tools video editors, designers, and others who do not specialize in audio need to accomplish their everyday work such as:
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Arranging audio files on multiple tracks
Making quick edits and applying fades
Matching volume levels with a single command
Removing unwanted noises and background sounds
Adjusting tempo and pitch
Recording and polishing voice overs
Adding effects and filters
Previewing MP3 compression quality
Easily creating customized music without musical expertise.