Audacity is a cross-platform multitrack audio editor. It allows you to record sounds directly or to import Ogg, WAV, AIFF, AU, IRCAM, or MP3 files. It features a few simple effects, all of the editing features you should need, and unlimited undo. The GUI was built with wxWindows and the audio I/O currently uses OSS under Linux. Audacity runs on Linux/*BSD, MacOS, and Windows.