Complex gapless sound loop in AS3 - actionscript-3

Question

I have a WAV music file that I want to loop in Flash Pro. However, I am not sure how to work with this track, which has an opening part and a looping part.
The audio file would be 'divided' in three points: A, B and C. The looping part would be all the audio between points B and C, while the audio between A and B would be the opening part, which would be played only once.
I tried to divide the WAV into two files: A-B would be the intro file, and the B-C the looping file, so that right after the intro sound finishes, the looping sound begins.
Both files are on the library (right now I'm only focusing on local files).
To summarize, here's the AS3 code:
import flash.media.Sound;
import flash.events.Event;
import flash.media.SoundChannel;
var introMusic:Sound = new heroIntro();
var loopingMusic:Sound = new heroLoop();
var musicChannel:SoundChannel = new SoundChannel();
musicChannel = introMusic.play();
musicChannel.addEventListener(Event.SOUND_COMPLETE,continueMusic);
function continueMusic(e:Event):void{
musicChannel.removeEventListener(Event.SOUND_COMPLETE,continueMusic);
musicChannel= introMusic.play();
musicChannel.addEventListener(Event.SOUND_COMPLETE,continueMusic);
}
The loop is completely gapless, but the transition between the intro and the looping parts makes an annoying gap sound. How could I make that transition gapless?

Answer 1

You might be able to avoid the gap sound by playing the 2nd Sound in a different SoundChannel a second or so before the 1st Sound finishes playing. It's not an elegant solution, but it might work. Perhaps something like this:
import flash.media.Sound;
import flash.events.Event;
import flash.media.SoundChannel;
var introMusic:Sound = new heroIntro();
var loopingMusic:Sound = new heroLoop();
var introChannel:SoundChannel = new SoundChannel();
var loopingChannel:SoundChannel = new SoundChannel();
var hasBegunLooping:Boolean = false;
introChannel = introMusic.play();
function update():void{ //called every tick
if(!hasBegunLooping && introChannel.position > introMusic.length - 1000){
loopingChannel = loopingMusic.play(0, int.MAX_VALUE);
hasBegunLooping = true;
}
}