Flash MX sound objects?

I have 4 buttons. Each are a movie clip that has 2 frames (the down and over).
the rollover has a click sound to it. Is it worth my while to do that with AS? or just put it up in the timeline (the sound).
Thank you for your time!

u can use attachSound property for making it with AS.

import a sound file add a linkage name for actionscript.in the example below,it is logoff_id. put this code to the main timeline.

var my_sound:Sound = new Sound();

and than add the following code to the button: