Audacity is a free multi-track sound editor for MacOS, Windows, and Linux. It can record directly or import WAV, Ogg Vorbis, MP3, AIFF, and many other formats. Features include builtin effects, VST plugin loading, fast editing, and unlimited undo.
Warning: the following version of Audacity is beta quality! It contains dozens of new features, including a new toolbar, automatic resampling, and support for 32-bit samples, but it probably also contains new bugs.
Note: This version cannot read or write project files saved by Audacity 1.0 or older. It uses a new XML-based project file format.
DAW Control Surface