The script below shows how we can introduce speech with some initial music and then fade out the music and fade in the speech. Press the button in the movie, which will give you the instructions.

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The Script

// create movieclips to hold the sounds
_root.createEmptyMovieClip("empty1", _root.getNextHighestDepth());
_root.createEmptyMovieClip("empty2", _root.getNextHighestDepth());
//create two sound objects
var myAudio_1:Sound = new Sound(empty1);
var myAudio_2:Sound = new Sound(empty2);
//load both sounds and start them
myAudio_1.onLoad = function() {
	this.start();
};
myAudio_1.loadSound("../save_sound/lanier2/track1.mp3", true);
myAudio_2.onLoad = function() {
	//we stop audio 2 for now
	this.stop();
};
myAudio_2.loadSound("instructions.mp3", true);
//
//create 2 variables and give them values according to the volume settings you want
var x:Number = 0;
var y:Number = 100;
_root.onEnterFrame = function() {
	//set volume for sound 2 here
	myAudio_2.setVolume(x);
	//if statement: when sound 1 is half way played, increase volume
	//for sound 2 and decrease volume for sound 1
	if (myAudio_1.position>=myAudio_1.duration/2) {
	   //we now start audio 2
	   if (x == 10) {
	       myAudio_2.start();
	   }
	   //here you can set the fadespeed
	   x += 10;
	   y -= 10;
	   myAudio_1.setVolume(y);
	   if (y<=0) {
	       //stop playing sound 1 now
	       myAudio_1.stop();
	       delete _root.onEnterFrame;
	   }
	}
}