Macromedia flash mx 2004 User Guide

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Chapter 3:  Sound
Note: You can also access sound that resides in movie clip Timelines in much the same manner 
except you will need to use the tellTarget action in coordination with the gotoAndPlay() action. 
Here is an example of a script which targets a sound in a movie clip Timeline:
On(keyPress “1”){
TellTarget(“myMovieClip”){
GotoAndPlay(2);
}
}