# Audio Source as Voice

Use custom audio files as voice for your avatar videos.

To use an audio source as voice, first you need to set your voice type as `audio` and then provide either an `audio_url` or an `audio_asset_id` in the "**Voice Settings**" of the Create Avatar Video endpoint.

* **Use an Existing Audio Asset from HeyGen:** You can select an audio asset directly from HeyGen's library to integrate into your video.

## Create Your Video

Now that your voice settings are in place, proceed with creating your video using the [Create Avatar Video (V2)](https://movio-api.readme.io/reference/create-an-avatar-video-v2). Make sure to provide either an `audio_url` or an `audio_asset_id`. Exactly one of these parameters must be provided. Omitting both, or defining both, will result in an error. These parameters can be obtained from the response of the [Upload Asset](https://movio-api.readme.io/reference/upload-asset) API.