Flash Crowd Meter Puzzle

I want a variation on a flash file that acts as a crowd meter. The swf attached simply records the amount of sound and plots it on a scale of 0 to 100. What I want is a game that is based on this in the following way. After some time there appear "borders"in the field and the crowd has to make sound volume in such a way that the level stays between the indicated upper and lower bound. when the sound level the game is over and to total time is displayed. there should be a button such that it can start all over again. clear? if not i can supply more decscription.