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Flash Reference Guide

Aug 22, 2003

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The heart to controlling audio is with ActionScript. For this section I am not going to get too deep in the explanation in the details of what the ActionScript is doing programmatically.

Expand the "sound" folder. Right click on the file snd_1.mp3. Select Linkage... to open the Linkage Properties Window. To control the audio file with ActionScript you should add a linkage value. Then you can control the audio file in the Library from your ActionScript.
Select the "Export for ActionScript" check box. The Identifier will automatically fill in as snd_1.mp3. Change the Identifier to just snd_1.

Figure Insert Figure 2

The Linkage Properties for the MP3 file are changed.
Repeat this process for all five audio files. When you are finished the Library will list all of the Export Identifiers in the Linkage column.
Select frame 1 of the Scripts layer on the Time Line. Add the following variable. This will be used later to connect the "Play" button with the correct file:
```
var i = 0;
```
The first thing you need to do when connecting to a new sound file with ActionScript is give your new sound a Variable name and to declare the sound file. Here this is done with the following line of ActionScript:
```
snd_1 = new Sound();
```
You now have a new variable called snd_1. This variable must now be connected to a sound file in the Library. This is where the linkage Identifiers come in handy. The following ActionScript attaches the linkage identifier for snd_1 to the snd_1 variable:
```
snd_1.attachSound("snd_1");
```

The other four file can be connected in the same way:

snd_2 = new Sound();
snd_2.attachSound("snd_2");
snd_3 = new Sound();
snd_3.attachSound("snd_3");
snd_4 = new Sound();
snd_4.attachSound("snd_4");
snd_5 = new Sound();
snd_5.attachSound("snd_5");

The final file you will connect to is an MP3. For this to work you will to place the MP3 in to the same folder as the Flash file you are working on. As with the previous steps you need to create a new variable and declare it a new sound file:
```
snd_6 = new Sound();
```
The difference comes when you connect to the MP3 file. You need to use a new loadSound method. In the parenthesis after the loadSound you need to specify the location of the MP3 file and whether you want the file to stream (the setting is "true") or be event driven (the setting is false). An event driven MP3 file must completely download before playing.
```
snd_6.loadSound("soundtrack.mp3", false);
```
Select the arrow button on the Stage. Name the button "play_btn" as you did with the other buttons. Select frame 1 of the "scripts" layer. Open the Actions Panel and add the following SWITCH statement. The SWITCH statement looks for the value of the variable "i" and begins playing the correct sound file.

play_btn.onRelease = function() {
  stopAllSounds();
  switch (i) {
  case 1 :
    _root.txt_text.text = "This is a WAVE file playing";
    _root.my1_sound.start(0, 500);
    break;
  case 2 :
    _root.txt_text.text = "You can play AU, AIFF, WAV and MP3 Files!";
    _root.my2_sound.start(0, 500);
    break;
  case 3 :
    _root.txt_text.text = "External files can be linked into Flash";
    _root.my3_sound.start(0, 500);
    break;
  case 4 :
    _root.txt_text.text = "ActionScript controls the playback functions";
    _root.my4_sound.start(0, 500);
    break;
  case 5 :
    _root.txt_text.text = "This is an embedded MP3 file playing";
    _root.my5_sound.start(0, 500);
    break;
  case 6 :
    _root.txt_text.text = "This is an external MP3 file playing";
    _root.my6_sound.start(0, 500);
    break;
  }
};

You will see I have added an extra line that allows you to insert some text with each case statement. You can change these if you want.

The "start" property is the control that gets the whole thing going. Each time a case statement is matched the start property begins playing a specific "snd" variable. Within the parenthesis at the end of the "start" property are two values. The first states how many seconds into the sound clip to start playing and the second states how many loops the sound clip should go through.

To avoid all of the sound clips from playing over the top of each other there is a stopAllSounds() action. This simply stops all sounds from playing before the next sound is chosen by the SWITCH statement.

Go ahead and preview the Jukebox. Select a button and then press the play button. Now you can make your own custom juke boxes.

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