Sound design for short AI video ads: voice, music and SFX

Sound design for a short AI video ad comes down to three layers: a voiceover that carries the message, a music bed that sets the mood, and sound effects that make the cuts land. Make them in that order — voice first, music second, effects last — then mix so the voice always wins. Here is a simple workflow for a 15–30 second ad.

What goes into the sound of a short ad?

A short ad has three sound layers, and each has one job.

• Voiceover — says the message and the brand name (text to speech).
• Music bed — sets the mood and the tempo (music generation).
• Sound effects — hits on cuts and ambience under the scene (sound effect generation).

Start with the voiceover

Record or generate the voiceover first, because its timing decides how long each shot and each music section should be.

• Write the script to the length of the ad and read it aloud with a timer before generating.
• Pick one voice and keep it for every version of the campaign.
• ElevenLabs added audio effects to its text-to-speech API in October 2026: filter presets, perceived distance, reverb, a looped background noise bed and stereo panning.

Brief the music like a band

A music bed works best when the prompt names the use, the tempo and the arrangement.

• Name the use first — ElevenLabs' music guide opens its example with "Track for a high-end mascara commercial".
• Add "instrumental only", otherwise the model may write lyrics.
• Give a tempo and key, e.g. "100 BPM, in A minor", so cuts can fall on the beat.
• Describe the arrangement in order: "start with just…, then bring in…", and say where it stays quiet.

Eleven Music makes tracks from 3 seconds to 5 minutes and, per ElevenLabs, is cleared for nearly all commercial uses, including advertising — check the music terms for your plan.

Add sound effects on the cuts

Sound effects are short and specific: a whoosh on a transition, an impact on the logo, an ambience under a scene.

• Describe one sound clearly ("glass shattering on concrete") or a sequence in order ("footsteps on gravel, then a metallic door opens").
• Sound terms such as whoosh, impact, braam, ambience, one-shot and loop are understood.
• ElevenLabs Sound Effects makes up to 30 seconds per generation; a higher "prompt influence" follows the text more literally, a lower one adds variation.
• Use loops for background ambience, one-shots for hits.

Mix so the voice wins

In the final mix the voice sits on top, the music ducks under it, and the effects stay short.

• Lower the music whenever someone speaks, and bring it up in the gaps.
• Listen on a phone speaker and on headphones before export.
• Add captions: many people watch with the sound off.
• For broadcast, Europe uses EBU R 128 with a target of −23 LUFS; for social, follow the platform's own delivery specs.

Localising the same ad? Read our guide to AI dubbing for video ads and the camera moves glossary for AI video prompts. Our films are in the video portfolio. Need an ad with picture and sound made together? Tell us about your project.

P.S. The caption under the cover image is a ready-to-use prompt. Copy it into Midjourney, Higgsfield or any image generator and make your own version.