How to Prepare Scripts for Natural AI Speech
Script habits that make AI voices sound natural: sentence length, punctuation for pauses, numbers and abbreviations, paragraphs, and when to use voice settings.
By the MCV Labs team · · 6 min read
Most “robotic” AI narration isn't caused by the voice — it's caused by text written to be read, not heard. The same voice can sound stiff on one script and natural on another. These are the habits that make the biggest difference, in roughly the order they matter.
1. Keep sentences short enough to say in one breath
A human narrator breathes between ideas. Long sentences with several clauses force a voice to either rush or pause in odd places. Aim for one idea per sentence, and split anything you can't say aloud comfortably in one breath.
2. Use punctuation to direct the pauses
- A comma gives a short pause; a full stop gives a longer one. Add or remove them to change the rhythm.
- A question mark changes the intonation at the end of the sentence — use it only for real questions.
- Blank lines between paragraphs are kept, so a new paragraph reads like a new thought.
- For an exact pause (for example two seconds before a reveal), use Script mode in the studio and set the pause between segments instead of typing dots.
3. Write numbers, dates and abbreviations the way you want them said
“12 March 2026”, “3:45 PM” and “₹1,250” are generally read naturally. Ambiguous forms are not: is “1/2” a date or a half? Is “Dr.” doctor or drive? Write the spoken form when there's any doubt, and spell out acronyms you want read letter by letter (“M C V”) or as a word.
4. Don't shout in capitals
ALL CAPS doesn't reliably add emphasis and can be read as an acronym. To stress a word, put it at the end of a short sentence, or describe the delivery with a speaking style instead.
5. Fix names once with a pronunciation rule
Brand names, people's names and jargon are the most common mistakes. In the studio, add a respelling rule (for example “MCV” → “M C V”) under Voice Style & Emotion. The rule changes only what the voice reads — your saved script stays as you wrote it — and you can reuse it on every generation.
6. Then adjust the voice settings — gently
- Speed: 0.9–1.1× sounds natural for most narration. Very slow or very fast speech is harder to follow.
- Speaking style: Natural conversation suits most explainers; Professional narration suits courses; Emotional storytelling suits stories. The effect is real but subtle, and varies by voice.
- Stability (on voices that offer it): lower is more expressive and varied, higher is more consistent between takes.
- Bass / voice depth: Light, Natural or Deep changes the tone of the generated audio without changing the words or timing.
Use “Preview First Line” before generating a long script. It costs a fraction of the full script and uses exactly the same settings, so what you hear is what you'll get.
7. Listen once, fix lines, not the whole take
After generating, listen through once with the script in front of you and note the lines that sound wrong. In Script mode you can change and regenerate just those segments and export the joined file, instead of starting over.