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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.

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Background music

Open Audio in the tool rail.
The Background Music panel

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):
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).
Publishing on YouTube? Some library tracks may trigger copyright claims (④). Music you generate with AI Music or tracks you own are the safer choice.

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Music volume per scene

Each scene has its own Background music slider in its playback settings (see Scenes). 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.

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Sound effects

Open Sounds to see every sound effect in the video.
The Sounds panel with SFX on hooks, transitions and payoffs

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:
  • 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.

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Add a sound

Click + (①) to open the sound picker:
The Add sound dialog

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).
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.