We made a quick mp3 BBCode that will display a small mp3 player and allow you to listen to a linked mp3. To post an mp3 file, just wrap the url to the mp3 file in “mp3” bbcode. Like this:
[mp3]http://exampledomain.com/example.mp3[/mp3]
For an example of what it displays see here:
http://able2know.org/topic/124541-2#post-3508894