Audacity is free audio recorder and editor software for Windows, Mac OS X, GNU/Linux and other operating systems.
Features :
- can record from microphone, line in, and other source
 - Dub over existing tracks to create multi-track recordings.
 - Record up to 16 channels at once (requires multi-channel hardware).
 - Level meters can monitor volume levels before, during, and after recording.
 - Import and export WAV, AIFF, AU, and Ogg Vorbis files.
 - Import MPEG audio (including MP2 and MP3 files) with libmad.
 - Export MP3s with the optional LAME encoder library.
 - Create WAV or AIFF files suitable for burning to CD.
 - Import and export all file formats supported by libsndfile.
 - Open raw (headerless) audio files using the “Import Raw” command.
 - Note: Audacity does not currently support WMA, AAC, or most other proprietary or restricted file formats.
 - fast in editing large files
 - Edit and mix an unlimited number of tracks.
 - Use the Drawing tool to alter individual sample points.
 - Fade the volume up or down smoothly with the Envelope tool.
 - unlimited undo and redo in audio editor
 - Change the pitch without altering the tempo, or vice-versa.
 - Remove static, hiss, hum, or other constant background noises.
 - Alter frequencies with Equalization, FFT Filter, and Bass Boost effects.
 - Adjust volumes with Compressor, Amplify, and Normalize effects.
 - Other built-in effects include: Echo, Phaser, Wahwah and Reverse
 - Record and edit 16-bit, 24-bit, and 32-bit (floating point) samples.
 - Record at up to 96 KHz.
 - Sample rates and formats are converted using high-quality resampling and dithering.
 - Mix tracks with different sample rates or formats, and Audacity will convert them automatically in realtime.
 - Many Plugin Support this Software including : LADSPA plugins,VST plugins you can also build new plugins using integrated Nyquist Programming langiuage
 - Spectrogram mode for visualizing frequencies.
 - Plot Spectrum command for detailed frequency analysis.
 - Support multi platform OS : Windows, Mac OS X, GNU/Linux and other operating systems.
 
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