When I teach Flash classes we always split them into two categories: Designer and Developer. This article focuses entirely on the Designer and how sounds can be added to and edited in .swf files without the use of Actionscript.
Start by opening Flash's library of buttons: Window > Common Libraries > Buttons.
One of the most fun sets of buttons to use are the Arcade Buttons, these are in the classic buttons folder. They bring back many wasted hours of my youth.
Arcade Buttons in Library
Select the color you want and frag it onto Scene 1.
Double-click on the instance of the button you just inserted to open the Symbol.
Button Symbol open
As you can see there are a number of layers already in place in this button. Add another layer and then double click on its name and change it to read "Sounds".
The layer "Sounds" is there to hold any sound effects we now add to this button. Adding a layer specifically for sound makes it easier to modify or remove them later, as they will all be in one easy to find place.
To find Flash's built-in sound library go to Window > Common Libraries > Sounds and the Library will open in a new panel.
Take a minute to play a few sounds; there are some "interesting" ones. I haven't found a use for the Human Burp yet for one...............OK, that will do!
The effect we are going to use is called "Sports Basketball Dribble in Gym Short.mp3".
Tip: Try typing it in the Search field in the Sounds Library Panel.
The sound will be heard every time the button is clicked. To enable this the sound needs to be added to the Down state on the buttons Timeline.
Select the Down frame on the Sounds Layer and press F6 to add a keyframe. This keyframe will hold the sound.
To add the sound to this new keyframe, pick it up in the Sounds Library and drag it to the document, not the keyframe.
Sound wave in TL
The audio will now sit on the down keyframe on the Sounds layer. You can make out a blue waveform inside the keyframe if you look on the timeline.
Click on the keyframe in the Timeline to select it and have a look at its properties: the Sound property shows the sound applied.
Save the Flash Document to the Desktop, File > Save or Command-S and name it Button1.
Then press Command-return to Test the Movie.
The sound effect is too long, and takes too long to start. Press the button more than once and we start to get an echo effect. Not good!
Back in your Flash project, click on the Keyframe that you added sound to on the "Sounds" Layer in your Button symbol.
Sound Keyframe Selected
Look at the Properties for the Layer in the Properties panel and find the Sound Property again.
Click on the Pencil icon next to the dialogue box that contains the sound name.
A new window opens that contains the Audio Waveform for both tracks of your sound effect.
Sound Editor Window
Between the two Audio Tracks sits a timeline for the audio. At each end sits a handle, as I've indicated.
Grab the handle at the start and drag it to the right until it's placed just before the second set of Audio Waveform peaks. Now grab the second handle and drag it to the left until it is positioned just after the end of the same set of peaks.
Play the sound in the Sound Editor. You have trimmed the longer sound down so it's just the part needed for the button.
Save the project again and then publish a test movie by pressing Command-return.
Click the button in the SWF to hear the changes.
A nicely performing button, with no Actionscript required, as promised.