• the Sound() class can now load .mp3 files.

// Create a new Sound object.
var music = new Sound();

// Load the mp3 sound. Second argument specifies
// sound type: streaming (true) or event (false).
music.loadSound("trance.mp3", true);

// Sound is still controllable. This mutes the sound.
music.setVolume(0);

// Add a couple of methods to the sound class that
// fade a sound in from 0-100% volume over its duration.
Sound.prototype.startFadeIn = function () {
  this.volInterval = setInterval(this, "fadeIn", 10);
}

Sound.prototype.fadeIn = function () {
  this.vol = Math.floor(this.position / this.duration * 100);
  this.setVolume(this.vol);
  // Stop calling fadeIn() if the sound has finished playing.
  if (this.vol == 100) {
    clearInterval(this.volInterval);
  }
  trace("volume: " + this.vol);
}

// Try our startFadeIn() method.
music.startFadeIn();