Audacity is a free open source digital audio editor and recording computer software application, available for Windows, Mac OS X, Linux and other operating systems. Audacity was started in May of 2000 by Dominic Mazzoni and Roger Dannenberg at Carnegie Mellon University. As of 10 October 2011, it was the 11th most popular download from SourceForge, with 76.5 million downloads. Audacity won the SourceForge 2007 and 2009 Community Choice Award for Best Project for Multimedia.
Features and usage[edit]
Screenshot of an Audacity (Audio Editor) project
In addition to recording audio from multiple sources, Audacity can be used for post-processing of all types of audio, including podcasts by adding effects such as normalization, trimming, and fading in and out. Audacity has also been used to record and mix entire albums, such as by Tune-Yards.1 It is also currently used in the UK OCR National Level 2 ICT course for the sound creation unit.
Audacity's features include the following:
Importing and exporting of WAV, AIFF, MP3 (via the LAME encoder, downloaded separately), Ogg Vorbis, and all file formats supported by libsndfile library. Versions 1.3.2 and later support Free Lossless Audio Codec (FLAC). Version 1.3.6 and later also support additional formats such as WMA, AAC, AMR and AC3 via the optional FFmpeg library.
Recording and playing back sounds
Editing via Cut, Copy and Paste (with unlimited levels of Undo)
Multitrack mixing
A large array of digital effects and plug-ins. Additional effects can be written with Nyquist
Built-in LADSPA plug-in support. VST support available through an optional VST Enabler.
Amplitude envelope editing
Noise removal based on sampling the noise to be removed.
Audio spectrum analysis using the Fourier transform algorithm
Support for multi-channel modes with sampling rates up to 96 kHz with 32 bits per sample
Precise adjustments to the audio's speed while maintaining pitch (Audacity calls it changing tempo), in order to synchronize it with video or run for a predetermined length of time
Changes to the audio's pitch without changing the speed
Features of modern multi-track audio software including navigation controls, zoom and single track edit, project pane and XY project navigation, non-destructive and destructive effect processing, audio file manipulation (cut, copy, paste)
Conversion of cassette tapes or records into digital tracks by automatically splitting the audio source into multiple tracks based on silences in the source material
Support for multiple platforms — Audacity works on Windows, Mac OS X, and Unix-like systems (including Linux and BSD), among others
The latest stable version supports Windows 98/ME/2000/XP/Vista/7, but Windows 95 and NT are not supported.
Audacity uses the wxWidgets software library to provide a similar graphical user interface on several different operating systems.
Audacity supports the LV2 open standard for plugins and can therefore load software like e.g. Calf Studio Gear.
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