An "oh my goodness" reaction only works when the timing and tone match the shot. Use prompts (or choose a library clip) based on (1) emotion and intensity, (2) perspective and space, and (3) how long the reaction should hang before the next line. The tips below help you get a usable transient, a clean noise floor, and a tail that does not smear your dialogue edit.
Start with the emotion, not the words
Decide what the character actually feels: surprise, admiration, disbelief, or sarcastic annoyance. The same phrase can read wildly different depending on pitch movement and emphasis, so describe that in your prompt.
- Use intensity cues like calm, startled, or over-the-top
- Call out inflection: rising question, flat deadpan, or excited lift
- Ask for clean consonants if captions or fast cuts need clarity
Match perspective and room tone
A close-mic reaction feels intimate and comedic, while a distant call implies location and movement. Pick the space that matches the camera distance and the rest of your production audio.
- Close and dry for overlays, stickers, and punch-in reactions
- Distant with reflections for hallways, kitchens, or off-screen calls
- Phone or speaker treatment for call scenes and voicemail jokes
Dial in timing: attack and tail
Reactions live or die on timing. If the attack is too slow, it misses the cut; if the tail is too long, it steps on the next line. Use duration plus tail language to control editability.
- Ask for a fast attack when syncing to a visual reveal
- Keep tails short for dialogue-heavy scenes and quick banter
- Use a longer sustain only when you want the reaction to linger
Avoid common pitfalls in prompts
Small wording changes can cause unusable results. Be explicit about cleanliness and intent so you do not end up with harsh sibilance, distorted peaks, or an unintended mood.
- Specify no distortion, no clipping, and low background noise
- Request family-friendly delivery if the content is for kids
- Avoid vague prompts like "funny" without describing cadence or intensity
