Here is a little example from my blog :
This very small plugin lets you insert the DewPlayer into your post provinding you the ability to play mp3 audio content. It's based on the video plug shipped with B2Evolution. I made this plugin because i didn't find any other clean way to insert audio elements to my posts, and because I never tried to make a plugin before and it seemed fun ;-)
Here is a little example from my blog :
Unzip the downloaded file.
Upload a version of DewPlayer to somewhere in your blog. (It can be found HERE.) As it only handle mp3 source, only mini or classic edition should be usefull for you...
Edit the '_dewplayer.plugin.php' file to replace the DewPlayer location to match yours. This is done by editing this line 'define('DEWPLAYER_LOCATION','/media/dewplayer.swf');'.
Now upload content to your b2evolution installation plugins repository.
In your backoffice go to "plugins install" and install the DewPlayer plugin that should be listed.
Now you should be able to insert audio content. This can be done by inserting tags of the form '[dewplayer:/folder/file.mp3]' or by using the 'DewPlayer button'.
Version 0.0.1 is available here.