Audacity

Description
Audacity® is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

Tutorials
Audacity - How to get professional sounding mix

Official Site
http://audacity.sourceforge.net/

Official Download Page
http://audacity.sourceforge.net/download/

Official Forum
http://forum.audacityteam.org/

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