Looking for a powerful audio editor or audio recorder? Want a free audio recording software? Try Audacity, a free, open source software for recording and editing sounds. It can record live audio through a microphone or mixer, or digitize recordings from cassette tapes, vinyl records, or minidiscs. Features include envelope editing, mixing, built-in effects and plug-ins, all with unlimited undo. Audacity is licensed under the GNU General Public License (GPL) and is available on Mac OS X, Windows, and GNU/Linux.
Features of Audacity:
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Record from microphone, line input, or other sources.
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Dub over existing tracks to create multi-track recordings.
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Record up to 16 channels at once.
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Easy editing with Cut, Copy, Paste, and Delete.
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Import and export WAV, AIFF, AU, and Ogg Vorbis files.
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Create WAV or AIFF files suitable for burning to CD.
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Import MPEG audio (including MP2 and MP3 files) with libmad.
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Export MP3s with the optional LAME encoder library.
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Change the pitch without altering the tempo, or vice-versa.
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Remove static, hiss, hum, or other constant background noises.
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Alter frequencies with Equalization, FFT Filter, and Bass Boost effects.
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Adjust volumes with Compressor, Amplify, and Normalize effects.
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Record and edit 16-bit, 24-bit, and 32-bit (floating point) samples.
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Spectrogram mode for visualizing frequencies.
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Add new effects with additional plugins.
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Write new effects with the built-in Nyquist programming language.
Download Audacity:
http://audacity.sourceforge.net/download/