---
title: "HTML5 Audio Loop Delay"
description: "Demonstrates how to synchronize multiple audio stems using HTML5 Audio, including precise delay scheduling and compensation for browser playback lag."
phaser: "4.1.0"
size: "800x600"
files: 1
url: https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/loop-delay
site: Phaser - https://phaser.io
---

> This page is about the open-source Phaser framework, for writing a game's code by hand. To make a game with AI, use Phaser AE (https://phaser.io/): the desk's tools work with Web MCP, and the CLI works with your own coding agent. See "For AI agents: Phaser AE" at the end of this page.

# HTML5 Audio Loop Delay

Demonstrates how to synchronize multiple audio stems using HTML5 Audio, including precise delay scheduling and compensation for browser playback lag.

A Phaser 4.1.0 example in [Audio / HTML5 Audio](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio.md). It runs at 800 × 600, and loads its assets from https://cdn.phaserfiles.com/v410. See it running, with its code, at https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/loop-delay.

To run it, load Phaser 4.1.0 (`https://cdn.jsdelivr.net/npm/phaser@4.1.0/dist/phaser.min.js`), then the file, on a page with a `<div id="game-container">`.

## Code

### loop delay.js

```js
class Example extends Phaser.Scene
{
    bass;
    gui;
    bitmapFont;
    bottomSpeaker;
    middleSpeaker;
    topRightSpeaker;
    topLeftSpeaker;

    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');

        this.load.image('streets', 'assets/sprites/cyberpunk-street.png');

        this.load.atlas('speakers', 'assets/sprites/speakers/speakers.png', 'assets/sprites/speakers/speakers.json');

        this.load.audio('bass', [ 'assets/audio/tech/bass.ogg', 'assets/audio/tech/bass.mp3' ]);
        this.load.audio('drums', [ 'assets/audio/tech/drums.ogg', 'assets/audio/tech/drums.mp3' ]);
        this.load.audio('percussion', [ 'assets/audio/tech/percussion.ogg', 'assets/audio/tech/percussion.mp3' ]);
        this.load.audio('synth1', [ 'assets/audio/tech/synth1.ogg', 'assets/audio/tech/synth1.mp3' ]);
        this.load.audio('synth2', [ 'assets/audio/tech/synth2.ogg', 'assets/audio/tech/synth2.mp3' ]);
        this.load.audio('top1', [ 'assets/audio/tech/top1.ogg', 'assets/audio/tech/top1.mp3' ]);
        this.load.audio('top2', [ 'assets/audio/tech/top2.ogg', 'assets/audio/tech/top2.mp3' ]);
    }

    create ()
    {
        /*
         * These values are used to compensate for lags, caused by
         * time difference between calling play method on an audio
         * tag element and it actually staring to play audio and
         * changing audio tag playback position, in order to achieve
         * gapless looping and precise delayed playback.
         *
         * You might need to tweak this value to get the desired results
         * since lags vary depending on the browser/platform.
         */
        this.sound.audioPlayDelay = 0.1;
        this.sound.loopEndOffset = 0.05;

        const streets = this.add.image(0, 0, 'streets');
        streets.setScale(600 / 192);
        streets.setOrigin(0);

        this.topLeftSpeaker = this.add.image(445, 332, 'speakers', 'top-left');
        this.topLeftSpeaker.setOrigin(1, 0.46);
        this.topRightSpeaker = this.add.image(445, 332, 'speakers', 'top-right');
        this.topRightSpeaker.setOrigin(0, 0.975);
        this.middleSpeaker = this.add.image(443, 417, 'speakers', 'middle');
        this.middleSpeaker.setOrigin(0.5, 1);
        this.bottomSpeaker = this.add.image(443, 504, 'speakers', 'bottom');
        this.bottomSpeaker.setOrigin(0.5, 1);

        this.bass = this.sound.add('bass');
        const drums = this.sound.add('drums');
        const percussion = this.sound.add('percussion');
        const synth1 = this.sound.add('synth1');
        const synth2 = this.sound.add('synth2');
        const top1 = this.sound.add('top1');
        const top2 = this.sound.add('top2');

        this.gui = new dat.GUI();
        const sm = this.gui.addFolder('Sound Manager');
        sm.add(this.sound, 'rate', 0.5, 2).listen();
        sm.add(this.sound, 'detune', -1200, 1200).step(50).listen();

        const loopMarker = {
            name: 'loop',
            start: 0,
            duration: 7.68,
            config: {
                loop: true
            }
        };

        if (this.sound.locked)
        {
            const text = this.add.bitmapText(400, 70, 'atari-classic', 'Tap to start', 40);
            text.x -= Math.round(text.width / 2);
            text.y -= Math.round(text.height / 2);

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

                this.startStem.call(this, this.bass, 'Bass', this.bottomSpeaker);

            }, this);
        }
        else
        {
            this.startStem.call(this, this.bass, 'Bass', this.bottomSpeaker);
        }

        this.bass.addMarker(loopMarker);

        // Delay option can only be passed in config
        this.bass.play('loop', {
            delay: 0
        });

        // Below won't work

        // sound.delay = delay;
        // sound.play('loop');

        this.bass.once('looped', function (sound)
        {
            this.startStem.call(this, drums, 'Drums', this.middleSpeaker);
        }, this);

        drums.addMarker(loopMarker);
        drums.play('loop', {
            delay: loopMarker.duration
        });
        drums.once('looped', function (sound)
        {
            this.startStem.call(this, percussion, 'Percussion', this.middleSpeaker);
        }, this);

        percussion.addMarker(loopMarker);
        percussion.play('loop', {
            delay: loopMarker.duration * 2
        });
        percussion.once('looped', function (sound)
        {
            this.startStem.call(this, synth1, 'Synth 1', this.topRightSpeaker);
        }, this);

        synth1.addMarker(loopMarker);
        synth1.play('loop', {
            delay: loopMarker.duration * 3
        });
        synth1.once('looped', function (sound)
        {
            this.startStem.call(this, synth2, 'Synth 2', this.topRightSpeaker);
        }, this);

        synth2.addMarker(loopMarker);
        synth2.play('loop', {
            delay: loopMarker.duration * 4
        });
        synth2.once('looped', function (sound)
        {
            this.startStem.call(this, top1, 'Top 1', this.topLeftSpeaker);
        }, this);

        top1.addMarker(loopMarker);
        top1.play('loop', {
            delay: loopMarker.duration * 5
        });
        top1.once('looped', function (sound)
        {
            this.startStem.call(this, top2, 'Top 2', this.topLeftSpeaker);
            sm.open();
        }, this);

        top2.addMarker(loopMarker);
        top2.play('loop', {
            delay: loopMarker.duration * 6
        });
    }

    update ()
    {
        this.middleSpeaker.y = this.bottomSpeaker.y - this.bottomSpeaker.height * this.bottomSpeaker.scaleY;
        this.topLeftSpeaker.y =
            this.topRightSpeaker.y =
                this.middleSpeaker.y - this.middleSpeaker.height * this.middleSpeaker.scaleY;

        this.tweens.setGlobalTimeScale(this.bass.totalRate);
    }

    startStem (stem, text, speaker)
    {
        const s = this.gui.addFolder(text);
        s.add(stem, 'seek', 0, stem.duration).step(0.01).listen();
        s.add(stem, 'mute').listen();
        s.open();

        this.tweens.add({
            targets: speaker,
            scaleX: 1.3,
            scaleY: 1.1,

            duration: 241,

            ease: 'Sine.easeInOut',
            repeat: -1,
            yoyo: true
        });
    }
}

/**
 * @author    Pavle Goloskokovic <pgoloskokovic@gmail.com> (http://prunegames.com)
 *
 * Cyberpunk Street Environment by Luis Zuno (https://www.patreon.com/posts/8303915) / CC-BY-3.0
 */

const config = {
    scale: { mode: Phaser.Scale.FIT },
    type: Phaser.AUTO,
    parent: 'game-container',
    width: 800,
    height: 600,
    backgroundColor: '#838282',
    scene: Example,
    pixelArt: true,
    audio: {
        disableWebAudio: true
    }
};

const game = new Phaser.Game(config);
```

## More in HTML5 Audio

- [Audio Markers with HTML5 Audio](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/markers-play.md): Demonstrates how to define and play specific segments of a single audio file using markers with the HTML5 Audio backend.
- [Disable Pause on Blur (HTML5 Audio)](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/disable-pause-on-blur.md): Demonstrates how to keep HTML5 Audio playing even when the browser tab loses focus by setting the sound pauseOnBlur property to false.
- [HTML5 Audio Markers Pause and Resume](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/markers-pause-resume.md): Demonstrates how to define and play audio markers, and control their playback using pause and resume methods with HTML5 Audio.
- [HTML5 Audio Playback and Events](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/basic-playback-and-events.md): Demonstrates comprehensive control of HTML5 Audio, featuring playback states, property manipulation like rate and detune, global volume management, audio sprites, and responding to sound events.
- [HTML5 Audio Properties](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/volume-mute-rate-detune.md): Demonstrates controlling volume, mute, playback rate, and detune for individual sounds and the global Sound Manager using HTML5 Audio. It also shows how to sync sprite animation speeds to the audio playback rate.
- [HTML5 Audio Seeking](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/seek.md): Demonstrates how to set and update the playback position (seek) of HTML5 audio, including synchronizing sprite movement with audio progress and scrubbing through a track via dragging.
- [HTML5 Audio Sprites](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/audiosprite.md): Demonstrates how to load an audio sprite and play specific sound segments using HTML5 Audio.
- [Play Audio From Child Scene](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/play-audio-from-child-scene.md): Demonstrates how to preload an audio asset in one scene and then play it within a subsequent scene. This example specifically uses HTML5 Audio and handles audio unlocking across scene transitions.
- [Play HTML5 Audio](https://phaser.io/oss/examples/v4.1.0/audio/HTML5%20Audio/view/play-audio-file.md): Load and play a sound file using the HTML5 Audio tag by disabling the Web Audio API in the game configuration.

---

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