How to raise one quiet section without the limiter shifting your audio
Tell Vizard Agent which section is quiet and that the rest must stay untouched. It raises that stretch, limits only the peak the boost creates rather than the whole programme, then checks whether the limiter introduced a delay and compensates for it, because a few milliseconds of shift puts the whole track out of sync with the picture.
What do you type into Vizard Agent?
Ask Vizard Agent for a targeted correction and a sync check in the same breath. The second half is the part almost nobody thinks to request, and it catches the failure you would otherwise ship without ever hearing it. A rough pointer to the quiet section is enough, because the measurement decides how much correction is needed.
Prompt
What does Vizard Agent actually do?
Vizard Agent corrects only the section that is low, then checks for a side effect nobody was looking for. A look-ahead limiter delays the signal so it can see a peak coming, and if that delay isn't compensated the whole track arrives late, so lip sync looks subtly wrong everywhere. In the session behind this article it:
- Profiled the audio level across the whole film and compared the frequency content of each dialogue section.
- Isolated the speaker's level section by section to find the one that was low.
- Applied the correction to that section, then diagnosed the unexpected peak the boost created.
- Boosted the low section with limiting on the overshoot only, and verified the dialogue matched across all sections.
- Checked whether the limiter had delayed the audio, compensated the delay and verified the rest was untouched, on a fix that covered only twelve seconds.
- Muxed the result and checked the final master specifications.
When does this not work well?
Level is not the only reason a section can sound wrong. If the quiet passage is also dull or roomy, raising it just makes it louder and still wrong, and it needs cleaning rather than boosting. A distant voice brings the room up with it, clipped audio has lost its detail, music underneath may need ducking instead, and very short dips are performance, not a fault.
Common questions
Why does a limiter delay the audio? Look-ahead limiters delay the signal to see peaks coming. Vizard Agent checks for it.
How much delay matters? A few milliseconds looks wrong on a close-up, which is why Vizard Agent measures it.
Is this the same as normalising? No. Normalising moves the whole track, while Vizard Agent corrects one section.