Audacity® is free, open source, cross-platform audio software for multi-track recording and editing. Audacity is available for Windows®, Mac®, GNU/Linux® and other operating systems. Check Audacity feature list, Wiki and Forum. Audacity has partial support for Mac Sierra. On a few Mac Sierra machines, some important extensions to the core of Audacity become unavailable. Full details here: Partial support for Sierra. This problem also affects Audacity 2.1.2. Audacity 2.1.3 takes steps to reduce the problems, but does not fix them entirely. Audacity 2.1.3 is also the last version of Audacity that will officially support Windows XP.