Audacity

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Audacity is a free, easy-to-use and multilingual audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. You can use Audacity to:
 * Record live audio.
 * Convert tapes and records into digital recordings or CDs.
 * Edit Ogg Vorbis, MP3, WAV or AIFF sound files.
 * Cut, copy, splice or mix sounds together.
 * Change the speed or pitch of a recording.
 * And more! See the complete [|list of features].