Whitepaper

AI voice in advertising: unlocking multilingual synthetic storytelling

Generative voice lets brands produce human-like audio in dozens of languages in days rather than weeks. Simon Ambrose explains how it works in practice, where it beats studio recording and where it still falls short.

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Cover artwork for the "AI Voice: Unlocking Multilingual Synthetic Storytelling" whitepaper, showing an AI robot with sound waves

What has changed

From the director’s chair to the dashboard

AI voice lets brands add narration to content that used to rely on supers, keep one recognisable voice across languages and personalise audio at scale. Newer models can even adjust prosody to local norms, making a voice sound more enthusiastic for a US audience or more reserved for a Japanese one.

The skill set has shifted too. A natural performance now takes prompt engineering and phonetics, adjusting pitch, speed and intonation line by line. The whitepaper also compares leading tools at the time of writing: ElevenLabs for pure audio, HeyGen for video localisation and Synthesia for avatar-led video.

The trade-offs at a glance

Where AI voice wins

Speed, scale and efficiency: audio in days rather than weeks, without repeated usage fees
Global consistency: one tonal character, such as a founder, mascot or brand ambassador, in every language
Hyper-personalisation: thousands of audio variations by name, location or behaviour

Where it needs care

Nuance: the breaths and hesitations that signal honesty can be lost in high-empathy categories such as healthcare and banking
Homogenisation: overused stock and cloned voices make brands sound alike
Expectations: heavy iteration can shift savings into prompting, engineering and tokens
Ethics and law: consent, cloning and usage rights need clear policies

Locaria’s six-step AI audio process

Start from the master asset: a locked script and a high-fidelity reference recording.
Transcreate the script, with stakeholders signing off through back-translations.
Choose the voice: clone the source voice, create a new character voice or select a preset.
Generate and refine, with a native speaker reviewing inflection and pronunciation.
Mix and master the voice to the film, then run final QC before delivery.
Where needed, add AI lip-sync to match words to mouth movements.

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See how we combine human and AI voice in our multilingual voiceover services.