# Audio

{% hint style="warning" %}
Available only on animated design and MP4 output
{% endhint %}

An audio layer allows audio integration within your design. 

#### Available properties

<table><thead><tr><th width="208">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong><code>audio_url</code></strong></td><td><p><strong>HTTP(s) URL of the audio</strong></p><p></p><p><em>It must be a public accessible link and have a filesize of 30 mo maximum.</em></p><p></p><p>Supported files: <strong><code>mp3</code></strong>, <strong><code>wav</code></strong></p></td></tr><tr><td><strong><code>max_volume</code></strong></td><td><p>Float (between <code>0</code> and <code>1</code>)</p><p>Default value: <code>1</code></p><ul><li><code>1:</code> the sound will be played at default volume</li><li><code>0.5:</code> the sound will be played at half volume</li><li><code>0:</code> No sound will be played</li></ul></td></tr><tr><td><strong><code>speed</code></strong></td><td><p>Float (between <code>0.25</code> and <code>2</code>)</p><p>Default value: <code>1</code></p><ul><li><code>1:</code> speed 100%</li><li><code>0.5:</code> speed 50%</li></ul></td></tr></tbody></table>

```json
    "audio_0": {
      "audio_url": "https://example.com/audio.mp3",
      "speed": 1,
      "max_volume": 1
    }
```