Why doesn't MP3 audio play on the Mac?
Timelines that normally play audio on other platforms do not work on the Mac. This includes MP3 in files and many radio stations that stream audio as MP3.
It does now!
The latest versions of Quotidian 1.3 use GStreamer and the native audio support on the Mac to play MP3.
The original problem was caused by a the lack of GStreamer support that was not encumbered by patent and license restrictions. Quotidian does not distribute MP3 decoders but relies on the decoders supplied by operating environments.