Sams Teach Yourself Flash™ MX ActionScript in 24 Hours > Controlling Sound with ActionScript > Task: Panning Sound - Pg. : Creative Edge

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Task: Panning Sound

You can also adjust the pan of a sound while the sound is playing. You can use this to make sounds appear to come from one side and travel to the other.

1.	Create a new movie.
2.	Import the sound 22airplane.wav from the CD-ROM.
3.	Set the sound's Linkage properties so that it exports with the movie and its linkage name is 22airplane.wav.
4.	Create a simple shape and convert it to a movie clip. Name it actions.
5.	The `load` handler attached to this movie clip starts the sound playing. It sets the pan to -100 so that the sound comes only from one side. onClipEvent(load) { // load sound thisSound = new Sound(); thisSound.attachSound("22airplane.wav"); // set initial pan thisSound.setPan(-100); // play three times thisSound.start(); }
6.	The `enterFrame` handler looks at the `position` and `duration` properties of the sound object. These are both measured in milliseconds. By dividing these by each other and multiplying by 200, you get a value from 0 to 200. Subtract 100 to get a value from -100 to 100. Then, set the pan to this value: onClipEvent(enterFrame) { // get value from -100 to 100 based on position pan = 200*thisSound.position/thisSound.duration - 100; // set pan thisSound.setPan(pan); } The result is that the sound starts on one side, coming completely out of one speaker. Then the sound travels to the other side as `setPan` is used to set the pan to values between -100 and 100. The sound should end with a pan of 100.

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