Audacity is a free digital audio editor application.

Some of Audacity's features include:
  • Importing and exporting WAV, AIFF, MP3 (via the LAME encoder, downloaded separately), Ogg Vorbis, and other file formats
  • Version 1.3.2 also supports Free Lossless Audio Codec (FLAC)
  • 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 100 kHz with 24 bits per sample
  • The ability to make precise adjustments to the audio's speed, while maintaining pitch, in order to synchronize it with video, run for the right length of time, etc.
  • 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.

Audacity can also be used for post-processing of all types of audio, including podcasts. It can be used for finishing podcasts by adding effects such as normalization, trimming, and fading in and out.

Get Audacity