Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, Ogg Vorbis, and MP3 files, and more.

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Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Echo, Change Tempo, and Noise Removal, and it also supports VST and LADSPA plug-in effects.

Changes in Audacity 1.3.5 beta :

• Recording / Playback:
- Several bugs fixed so that latency correction should be better, and more devices work correctly. Problems with invalid sample rates under Linux should be much rarer.
- Newer version of Portaudio library.
- New feature to record onto the end of an existing track (hold Shift while clicking Record).
• Import / Export:
- Updated versions of Libogg, Libvorbis, Libflac, Libsndfile and Twolame libraries.
- Handling of unsupported file formats more informative.
- Handling of file names with slashes on OS X improved. New dialog allows replacement of illegal file name characters on all platforms.
• Interface:
- Improved scaling and layout for rulers and VU meters.
- Envelope fixes/improvements including full control of undo/redo.
- New keyboard shortcuts and improved menu navigation.
- Preferences: More intuitive tab arrangement. New options for mute/solo and Metadata Editor behavior. Language can now be changed without restart.
- Expanded Build Information tab.
• Effects:
- New Vocal Remover plug-in, improvements for Generate effects.
• Compilation:
- Fixes when building Audacity with libraries disabled.
- Improvements to make Mac and Solaris builds easier.
• Security:
- Full fix for issue CVE-2007-6061 on systems where temporary directories can be changed by other users (thanks to Michael Schwendt).
• Miscellaneous:
- Updated translations for many locales.
- Several stability improvements.

Changes in Audacity 1.2.6 :

- Fix memory leaks on Windows.
- Correct font size problems.
- Enable missing FLAC support.