For our OAS friends. Another excellent article by Jeff. A snippet from the article:
In addition to the two types of accompaniments previously considered, Styles and Rhythm Patterns, there is a third option which is provided by the instrument’s Media Player. This can play a variety of media files, of which MIDI, Wave and MP3 files are the most useful for accompaniments. Unlike Styles and Rhythm Patterns however, which typically provide a loop of only a few bars, these media files can provide the accompaniment for an entire song.
For the full article >> http://www.wersiorganshowcase.com/backingtracks.html