Creating Sound Controls: Instructions from the Action Script Reference Guide:

1. To create buttons that start and stop sounds, show an animated movieclip that plays when sounds play, and create sliders to control volume and pan, go to HELP>Action Script Reference Guide>Creating Sound Controls:

2. Follow the step by step instructions in “Creating Sound Controls”:

3. As the instructions tell you, start by identifying a “Linkage” for your sound file:

Follow all instructions carefully, substituting your own Identifier name, and making sure all instance names correspond:

—your symbol instances should be named when you create the symbol (i.e. “playButton” or “stopButton” or “speaker” (speaker is for the movie clip);

—your instance names should also correspond to the instance name you enter into the Properties box, again, for buttons and movie clip;

The instructions in the “Creating Sound Controls” section tell you how to add action script to the FRAME in the timeline, in order to create a sound “object” and to control the action of your “speaker” movieclip. In order for your movie clip to play, its animation must take place in its own nested timeline.

4. In order to complete the sound controls, you must finish by adding Behaviors to your “playButton” and “stopButton.” 

Select the playButton on the Stage, go to WINDOW>DEVELOPMENT PANELS>BEHAVIORS.  Click the + sign in the Behaviors window and go to SOUND>“Load Sound From Library”.  The “on (release)” mouse event should be automatically inserted.  Then Click the + sign and go to SOUND>“Play Sound”, to add a second behavior to the play button.  Note the dialogs that comes up:

make sure you give the same the instance name in each case:

Repeat this process for the “stopButton”, this time adding the “Stop Sound” behavior.