How to make an avatar laugh -- need example

 My situation is that I've uploaded an MP3 that has some laughter on the track, but my avatar isn't recognizing the laughter in his facial expression.  Sitepal's customer service referred me to this example:

http://www.oddcast.com/support1/facial1.html

I asked for a clarification because I need to know how to integrate that with an MP3 playback, but SitePal customer service just ignores me.  Anybody want to give me a simple example of how it's done?  I can take it from there.