I have a game controller on the cover of the book on this page:

I want to track a series of clicks ( Left - Right - Top - Top - Bottom) to "unlock" a sound file. I'm not sure where to start with the Actionscript. I've created four buttons over the controller buttons, what code would I insert into each of them, and how would I use code to track the string/series of clicks to unlock the code when reached?

Thanks for any help!