# Mix Audio

> Layer several audio tracks into one file, with a volume from 0 to 200% for each. Put a voiceover over music, or effects over an ambience, before adding video.

Source: https://nodaro.ai/docs/nodes/audio/mix-audio

The **Mix Audio** node layers several audio tracks into one file, with a volume for each track from 0 to 200%. Use it to put a voiceover over background music, or sound effects over an ambience, and then send the mix to [Merge Video & Audio](https://nodaro.ai/docs/nodes/video/merge-video-audio).

- Found in: Audio › Edit Audio
- Output: audio
- API type: `mix-audio`

## When to use it
- Put a voiceover on top of background music.
- Combine sound effects with a music track.
- Mix dialogue with ambience for a cinematic scene.
- Build an audio bed from several generated tracks.

## Quick start
### Add the node

Press Tab on the canvas and choose **Audio › Edit Audio › Mix Audio**.

### Connect the tracks

Wire two or more audio nodes into the **Audio** input.

### Set the volumes

Open the settings panel. Each connected track has its own volume slider, from 0 to 200%. With more than one track, you can also drag the tracks into order.

### Run it

Click **Run** on the node. The mix appears on the node with a player.

Workflow: A voiceover is mixed over music at a lower level, and the mix is merged onto a video.

- Text to Speech → Mix Audio (audio)
- Suno Create Music → Mix Audio (audio)
- Mix Audio → Merge Video & Audio (audio)
- Generate Video → Merge Video & Audio (video)

## Input and output
| Input | Accepts | What it does |
| --- | --- | --- |
| **Audio** | Two or more audio nodes | The tracks to layer. Each connected node appears in the track list. |

The output, **Audio**, is one mixed file.

## Settings
| Setting | What it does |
| --- | --- |
| Track order | The connected tracks, listed by node name. Drag to reorder them. |
| Volume, per track | From 0 to 200%. The default is 100%. |

## Tips
- **Keep speech clear.** Leave the voiceover at 100% and set background music between 30% and 50%.
- **Boost with care.** A volume above 100% can clip and distort. Level quiet sources with [Adjust Volume](https://nodaro.ai/docs/nodes/audio/adjust-volume) first.
- **Layer on purpose.** Start with the voice, then add the music, then the effects.
- **Listen before you move on.** Check the mix on the node before you connect it to the next node.
- **One track only?** To change the volume of a single track, use [Adjust Volume](https://nodaro.ai/docs/nodes/audio/adjust-volume) instead.

## From the API
`POST /v1/mix-audio` takes `audioUrls`, a list of 2 to 20 tracks, and an optional `trackVolumes`. See [Voice and media](https://nodaro.ai/docs/developers/api/voice-and-media).

## Frequently asked questions

### How loud should background music be under a voiceover?

Keep the voiceover at 100% and set the music between 30% and 50%. The speech then stays clear over the music.

### Can I make a track louder than the original?

Yes, up to 200%. Use values above 100% with care, because they can clip and distort the sound.

### What is the difference between Mix Audio and Combine Audio?

Mix Audio plays the tracks at the same time, layered on top of each other. Combine Audio plays clips one after another.

### How many tracks can I mix?

Connect two or more audio nodes. Through the API, one mix takes from 2 to 20 tracks.