audio/fade in

 
var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', { preload: preload, create: create, render: render });

function preload() {

    game.load.image('disk', 'assets/sprites/ra_dont_crack_under_pressure.png');
    game.load.audio('boden', 'assets/audio/goaman_intro.mp3');

}

var music;

function create() {

    game.stage.backgroundColor = '#182d3b';
    game.input.touch.preventDefault = false;

    music = game.add.audio('boden');
    music.onDecoded.add(start, this);

    s = game.add.sprite(game.world.centerX, game.world.centerY, 'disk');
    s.anchor.setTo(0.5, 0.5);

}

function start() {

    music.fadeIn(4000);

}

function render() {
    game.debug.soundInfo(music, 20, 32);
}