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Audacity is a free, open source application for recording and editing audio. For more information, see the [http://audacity.sourceforge.net/ Audacity project home page].
Installing Audacity
Audacity is not installed by default in Ubuntu. To start using Audacity, install the package audacity from the Universe software channel. For more information on installing packages, see InstallingSoftware.
Once installed, click Applications -> Sound & Video -> Audacity to start Audacity.
Troubleshooting
After installation, you may receive the error message "Error Initializing Audio" with the explanation "There was an error initializing the audio i/o layer. You will not be able to play or record audio. Error: Host error."
To start Audacity without this error, press the Alt + F2 keys on your keyboard and type the following into the box which appears:
gksu audacity
If Audacity now starts without the error message, you can alter its menu entry with the new command by using the Alacarte Menu Editor. To start Alacarte, select Applications -> Accessories -> Alacarte Menu Editor.
Locating libmp3lame.so When Exporting MP3 Files
By default, the MP3 library libmp3lame.so is not installed in Ubuntu. To install this library, install the packages liblame0 and liblame-dev from the Multiverse software channel. (For more information on installing packages, see InstallingSoftware.)
When Audacity asks you to locate libmp3lame.so, you will be able to locate it in /usr/lib and export MP3 files.
Additional Resources
Audacity tips - http://www-users.york.ac.uk/~raa110/audacity/AudacityHelp.html
Creative Commons audio search - http://creativecommons.org/find/