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Audacity

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:

1. Record live audio.
2. Convert tapes and records into digital recordings or CDs.
3. Edit Ogg Vorbis, MP3, WAV or AIFF sound files.
4. Cut, copy, splice or mix sounds together.
5. Change the speed or pitch of a recording.

Audacity is free software, developed by a group of volunteers and distributed under the GNU General Public License (GPL).