Audacity

Audacity® is free, open source software for recording and editing sounds can be located at:  http://audacity.sourceforge.net/. Audacity was created by Dominic Mazzoni while he was a graduate student at Carnegie Mellon University. Mazzoni now works at Google, but is still the main developer and maintainer of Audacity, with help from many others around the world. Some of Audacity's features include:

·         Importing and exporting WAV, AIFF, MP3

·         Recording and playing sounds

·         Editing via Cut, Copy, Paste (with unlimited Undo)

·         Multi-track mixing

·         A large array of digital effects and plug-ins. Additional effects can be written with Nyquist

·         Amplitude envelope editing

·         Noise removal

·         Support for multi-channel modes with sampling rates up to 96 kHz with 24 bits per sample

·         The ability to make precise adjustments to the audio's speed while maintaining pitch (Audacity calls it changing tempo), in order to synchronize it with video, run for the right length of time, etc.

·         The ability to change the audio's pitch without changing the speed.

·         Contains major features of modern multi-track audio software [7] 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)

·         Converting cassette tapes or records into digital tracks by automatically splitting one wav (or the other supported types) track into multiple tracks based on silences in the track and the export multiple option.

·         Multi-platform: works on Windows, Mac OS X, and Unix-like systems (including GNU/Linux and BSD) amongst others.