Stream:
These buttons are components. When they are authored the person who makes them chooses what can be looked at, changed and so on.

before I get into this grab you a strong drink and have several in waiting.
What you will need to do to see the scripting is this.
1: Click on your movie clip in the Outline window (in this case b1) and high light it.
2: Now right click and look for Object Attributes, click on this.
3: Look for the Visibility box, and it will be checked(if you can't see the script) click on it to remove
the check mark.
4: Now you can see the script.
5: You go to make a change, OH SHIT it will not let you.

By now that drink should be several. So let's grab a B***, my old hippi day's.
6: Go back to the Object Attributes window ( steps 1 through 2)
7: Now look for the Access section and you will see that the Read Only Script Box is checked.
8: De check it.
9: That will do it. Now you can change your scripting in a component.
Now that I'm

and stoned, time to get some

.
But all this didnot answer your problem:

I have added your sound where it should be and set it to work in the main time line. It will not function or be called if you try to but it in the button script.
Check this out and then paste it in your movie.
onFrame (1) {
tooltip._visible = false;
var tipInt;
b1.onRollOver = function() {
tipInt = setInterval(showTip,100,"Button 1");
gotoAndPlay(20);
}
b1.onRollOut = function() {
hideTip();
}
b2.onRollOver = function() {
tipInt = setInterval(showTip,100,"Button 2");
gotoAndPlay(20);
}
b2.onRollOut = function() {
hideTip();
}
b3.onRollOver = function() {
tipInt = setInterval(showTip,10,"Button 3");
gotoAndPlay(20);
}
b3.onRollOut = function() {
hideTip();
}
var count = 0;
}
onFrame (2) {
stop();
}
Now import your sound or load your sound on Frame 21 the on frame 20 put a place marker.
By putting a place marker you sound will not play until you go to that frame.
Now that we have had a little fun give this a try, and don't worry about getting on top of components I am still learning!!!!!!!!!!!!!!!!!!!!!!!!!!!

Wayne