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Audacity is a free, easy-to-use 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, and WAV sound files.

Cut, copy, splice, and mix sounds together.
Change the speed or pitch of a recording.
And more! See the complete list of features.

This editor can record and play sounds and import and export WAV, AIFF, MP3, and OGG files. Edit your sounds using cut, copy, and paste features (with unlimited undo functionality), mix tracks, or apply effects to your recordings. The program 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 bass boost, wah wah, and noise removal, and the program also supports VST plug-in effects. This program is open-source, and this version adds tool tips, keyboard shortcuts, and OGG exporting and fixes some bugs.

Numerous bug fixes

Crashes on Windows when clicking in the track or in effects dialogs.

Crashes on OS X when closing or quitting.

Warning (on by default) now provided when importing uncompressed audio files and when read-directly uncompressed files are missing.

Full support added for later versions of the optional FFmpeg library up to current FFmpeg HEAD. More compatible U-Law/A-Law exports.

VST effects processing restored to full speed. Hang fixed when launching on OS X 10.5 PPC with VST effects present.

(OS X) Files imported from iTunes could create invalid characters in the .aup project file. See here for help re-opening older projects that have this error.

(Linux) Crashes or stalled recordings using the pulse device. Crashes using Play-at-Speed if Audacity was configured with libsamplerate.
Bug fixes:

Interface:
· "Retain labels" Interface Preference did not retain labels for a region that snapped exactly to both label edges.
· Projects did not save the track selected state.
· (Windows) JAWS screen-reader did not read the "Draw curves" and "Graphic EQ" radio buttons in Equalization correctly.

Envelopes and Clips:
· Exporting (or any render operation) on a track containing split lines could create clicks at the split lines.

Effects and Analysis:
· Normalize could crash if the track name contained "%".

Changes and Improvements:
· Duration controls when generating at a point now default to hh:mm:ss + milliseconds format. Selection Toolbar also defaults to that format on first installation or resetting preferences.
Toolbars visual improvements:
· "Snap To" in Selection Toolbar now has an explanatory tooltip
· Device Toolbar tooltips now display the selected device
· Increased default width of Device Toolbar and Meter Toolbar.
Improvements and some bug fixes to Nyquist effects, including:
· Delay (new option to prevent duration change)
· Sample Data Export (new "L-R on Same Line" layout option)
· Risset Drum (new "Amplitude" slider).
· Importing a labels file writes the file name to the name of the Label Track, and exporting a labels file offers the name of the last Label Track in the project.
· Removed the "Audio cache" option from Directories Preferences due to frequent crash reports. All data operations will now be written to disk and not to RAM.
· Removed the FFmpeg "On-Demand" option from Libraries Preferences (this fixes Audacity not building if configured --without-ffmpeg).
· Compilation: Progress on making the Modules feature mainstream. Modules can now be individually enabled and disabled in Preferences.
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