Audio Properties and Synchronization

class Example extends Phaser.Scene
{
    soundRight;
    soundLeft;
    horseRight;
    horseLeft;
    horseFrames = [];

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v410');
        this.load.bitmapFont('atari-classic', 'assets/fonts/bitmap/atari-classic.png', 'assets/fonts/bitmap/atari-classic.xml');

        for (let i = 0; i < 12; i++)
        {
            this.horseFrames.push({
                key: `horse${(`0${i}`).slice(-2)}`,
                frame: '__BASE'
            });
        }

        // Loading horse animation
        for (let i = 0; i < this.horseFrames.length; i++)
        {
            this.load.image(this.horseFrames[i].key, `assets/animations/horse/frame_${(`0${i}`).slice(-2)}_delay-0.05s.png`);
        }

        // Loading music
        this.load.audio('left', [
            'assets/audio/Rossini - William Tell Overture (8 Bits Version)/left.ogg',
            'assets/audio/Rossini - William Tell Overture (8 Bits Version)/left.mp3'
        ]);
        this.load.audio('right', [
            'assets/audio/Rossini - William Tell Overture (8 Bits Version)/right.ogg',
            'assets/audio/Rossini - William Tell Overture (8 Bits Version)/right.mp3'
        ]);
    }

    create ()
    {
        this.anims.create({
            key: 'horse',
            frames: this.horseFrames,
            frameRate: 20,
            repeat: -1
        });

        this.horseLeft = this.add.sprite(200, 300, 'horse09');
        this.horseLeft.setScale(400 / 480);

        this.horseRight = this.add.sprite(600, 300, 'horse10');
        this.horseRight.setScale(400 / 480);

        this.soundLeft = this.sound.add('left');
        this.soundLeft.play({
            loop: true
        });

        this.soundRight = this.sound.add('right');
        this.soundRight.play({
            loop: true
        });

        if (this.sound.locked)
        {
            const text = this.add.bitmapText(400, 50, 'atari-classic', 'Tap to start', 40);
            text.x -= Math.round(text.width / 2);
            text.y -= Math.round(text.height / 2);

            this.sound.once('unlocked', (soundManager) =>
            {
                text.visible = false;

                this.start();
            });
        }
        else
        {
            this.start();
        }
    }

    update ()
    {
        this.horseLeft.anims.timeScale = this.soundLeft.totalRate;
        this.horseRight.anims.timeScale = this.soundRight.totalRate;

        this.horseLeft.setAlpha(this.sound.volume * this.soundLeft.volume);
        this.horseRight.setAlpha(this.sound.volume * this.soundRight.volume);

        this.horseLeft.visible = !this.sound.mute && !this.soundLeft.mute;
        this.horseRight.visible = !this.sound.mute && !this.soundRight.mute;
    }

    start ()
    {
        this.horseLeft.play('horse');
        this.horseRight.play('horse');

        const gui = new dat.GUI();

        const sm = gui.addFolder('Sound Manager');
        sm.add(this.sound, 'mute').listen();
        sm.add(this.sound, 'volume', 0, 1).listen();
        sm.add(this.sound, 'rate', 0.5, 2).listen();
        sm.add(this.sound, 'detune', -1200, 1200).step(50).listen();
        sm.open();

        const sl = gui.addFolder('Left');
        sl.add(this.soundLeft, 'mute').listen();
        sl.add(this.soundLeft, 'volume', 0, 1).listen();
        sl.add(this.soundLeft, 'rate', 0.5, 2).listen();
        sl.add(this.soundLeft, 'detune', -1200, 1200).step(50).listen();
        sl.open();

        const sr = gui.addFolder('Right');
        sr.add(this.soundRight, 'mute').listen();
        sr.add(this.soundRight, 'volume', 0, 1).listen();
        sr.add(this.soundRight, 'rate', 0.5, 2).listen();
        sr.add(this.soundRight, 'detune', -1200, 1200).step(50).listen();
        sr.open();
    }
}

/**
 * @author    Pavle Goloskokovic <[email protected]> (http://prunegames.com)
 *
 * Images by Walter Newton (http://walternewton.tumblr.com/post/58684376490/like-a-train-in-the-night)
 * Music by Classical 8 Bit (http://classical8bit.tumblr.com/) / CC BY
 */

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    parent: 'game-container',
    width: 800,
    height: 600,
    scene: Example,
    pixelArt: true,
    audio: {
        noAudio: true
    }
};

const game = new Phaser.Game(config);