> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crealix.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Music & sound effects

> Choose background music, upload your own track, set the volume per scene, and place sound effects on hooks, transitions and payoffs.

Sound is half of a good short. Crealix picks music and a few sound effects for you when it generates a video; this page shows how to change them.

## Background music

Open **Audio** in the tool rail.

![The Background Music panel](https://mintcdn.com/crealix/IMW-nFsczZqF7L1x/images/app/v2/editor-audio-v2.jpg?fit=max\&auto=format\&n=IMW-nFsczZqF7L1x\&q=85\&s=3401aad0bdab1d288427305a45a6c195)

① Current track · ② Volume · ③ Library / My Music / Custom · ④ YouTube copyright note · ⑤ Use

1. The **current track (①)** is pinned at the top with its source (*Library*, *My Music* or *Custom*). Press play to hear it, or **×** to remove it.
2. **Volume (②)** sets the music level under the narration. **10–20%** keeps the voice clear; go higher for music-led videos.
3. Choose where the track comes from **(③)**:

**Library**

49 curated tracks tagged by mood — *Calm*, *Epic*, *Suspense*, *Romantic*, *Futuristic*, *Tiktok*, *Popular* and more. Search by name or mood, press play to preview, and click **Use (⑤)**.

**My Music**

Tracks you generated with [AI Music](https://docs.crealix.ai/tools/ai-music.md) or uploaded before. Music made in Crealix is yours to publish.

**Custom**

Upload your own audio file (up to 20 MB). It's stored securely in your project and used as the background track.

> [!WARNING]
>
> **Publishing on YouTube?** Some library tracks may trigger copyright claims **(④)**. Music you generate with [AI Music](https://docs.crealix.ai/tools/ai-music.md) or tracks you own are the safer choice.

### Music volume per scene

Each scene has its own **Background music** slider in its playback settings (see [Scenes](https://docs.crealix.ai/editor/scenes.md#inside-a-scene)). By default every scene *uses the global level*; drag a scene's slider to drop the music under a key line or raise it for a montage.

## Sound effects

Open **Sounds** to see every sound effect in the video.

![The Sounds panel with SFX on hooks, transitions and payoffs](https://mintcdn.com/crealix/IMW-nFsczZqF7L1x/images/app/v2/editor-sounds-v2.jpg?fit=max\&auto=format\&n=IMW-nFsczZqF7L1x\&q=85\&s=ccc308b3320736eab578fcd696d60787)

① Add a sound · ② SFX master volume · ③ Sounds in this video

Crealix adds a few sounds automatically, placed where they help retention. Each one shows its **tag**, the **scene** and **time** where it plays, and its **volume**:

| Tag | Where it goes |
| - | - |
| **HOOK** | The opening moment that grabs attention — a beep, a click, a notification. |
| **TRANS** | A scene change — whooshes, swooshes and glitches. |
| **DOPA** | A small reward moment — a reveal, a number, a punchline. |
| **TENSION** | Build-up before a reveal. |
| **PAYOFF** | The climax or conclusion — hits and impacts. |

* **SFX master volume (②)** controls all sound effects at once.
* Click a sound **(③)** to change it, move it or set its own volume, or press play to hear it.

### Add a sound

Click **+ (①)** to open the sound picker:

![The Add sound dialog](https://mintcdn.com/crealix/IMW-nFsczZqF7L1x/images/app/v2/editor-add-sound.jpg?fit=max\&auto=format\&n=IMW-nFsczZqF7L1x\&q=85\&s=23147216267c4e3570aaefd522cdc12e)

① Search and filter by tag · ② Sound library · ③ Scene · ④ Position in scene · ⑤ Volume · ⑥ Add sound

**1. Pick a sound**

Search, or filter by **Hook**, **Transition**, **Tension**, **Payoff** or **Dopamine (①)**. Press play on any sound **(②)** to preview it, then click it to select it.

**2. Choose where it plays**

Pick the **scene (③)**, then the **position (④)**: **Start**, **Middle**, **End**, or **Custom** for an exact time offset.

**3. Set the volume and add**

Leave **Auto** to follow the master volume, or choose **Custom (⑤)**. Click **Add sound (⑥)**.

> [!TIP]
>
> Less is more. One sound on the hook, a few on key transitions and one on the payoff usually beats a sound on every cut. Avoid ticking clocks under narration — they compete with the voice.


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