Since version 6 this Apple multimedia software decodes MP4 files. The basic player is free, the commercial Pro version also encodes MPEG-4 video and AAC as well as 3GP content.
Integrated music management application inspired by Apple's iTunes and based on the GStreamer and/or the Xine framework, plays AAC/MP4 through gst-plugin for FAAD2.
Integrated development system to generate real-time audio effects and synthesizer instruments using SAOL with SoundFont 2 for Structured Audio Score Language (SASL) and MIDI compositions.