Audacity 2.1.1 recently released, is a free, open source, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. A notable improvement is the new “Crossfade Tracks” effect which can now be used for crossfading two tracks. This replaces Cross Fade In and Cross Fade Out. Audacity 2.1.1 changelog Improvements Effects Built-in effects now support presets. New Limiter effect replaces Hard Limiter effect.