Change Tempo

Hi Everyone,
I’ve got this little project I’m working on and I’ve hit a snag. I’m trying to make a little rhythm creator for educational purposes and I can’t figure out how to change the tempo. I thought it would be as easy as having a button that upped the frame rate but that doesn’t seem to be possible.
I’m pretty much an actionscript newbie (more of a CSS guy) so any advice or pointers would really be appreciated. Thanks in advance!
http://danielbrowndesign.com/rhythmmaker.fla

Daniel