We switched it to MP3 at a high quality 320KPBS bit rate. Strangely, the default output audio was the antiquated AIFF, presumably for alphabetical reasons. Launching the application opens only a preferences panel, which we used to configure our output audio type and folder location for converted files. The README file gave a limited and brief overview of tasks the application could perform. Installation of X Lossless Decoder for Mac was nonexistent, with the mounted DMG containing the application, a README file, and a clickable icon to launch a command line interface. The program is fast and features an intuitive interface suitable for audiophiles and users comfortable working with audio files. X Lossless Decoder for Mac plays and converts from and to a wide variety of music file formats.