Audacity 1.2.0-pre1 is a public test release of the free Audacity sound editor. This release has improved professional-quality audio processing; major new features such as the ability to speed up, slow down, and alter the pitch of a track; and many bug fixes since the last beta version 1.1.3. Audacity is a fast multitrack audio editor and recorder for Linux, MacOS, and Windows. Supports WAV, AIFF, Ogg, and MP3 formats. Features include envelope editing, mixing, built-in effects and plug-ins, all with unlimited undo.
The Audacity web site has complete release notes and download links: http://audacity.sourceforge.net/