Audio Editor And Sound Recorder
Audacity is a free audio editor and sound recorder that comes with a full set of editing features. You can use it to edit your sound files using Cut, Copy and Paste (with unlimited Undo), mix tracks together and apply effects to your recordings. Audacity also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications.
Some of the built-in audio effects include Bass Boost, Wahwah, Equalization, Noise Removal and Normalize, Vocal Remover as well as support for VST plug-in effects.
Audacity 2.0 has dozens of new features and replaces all previous versions.