Use fine audio timing when a frame-sized move is too coarse for a click, fade or transient. I would zoom in, identify the audible problem and test a small adjustment while keeping picture sync under review. Sample-level control is precision for a defined task, not a reason to change every edit.
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Our recommendation
I would use subframe tools selectively for audible defects and precise automation. Judge the rendered result by listening and sync, not by how smooth the zoomed-in curve looks.
Understand the two time scales
Blackmagic documents subframe audio keyframes and markers on Resolve 21’s Edit page when sufficiently zoomed in. At 25 fps one picture frame lasts 40 ms; at 48 kHz one audio sample lasts about 0.0208 ms. Those are very different increments, so a picture-frame grid can be coarse for a short audio transition.
Keep the clip and track context visible. Moving a keyframe or fade is different from moving the entire dialogue recording. Do not change global clip timing merely to hide a small waveform discontinuity at one cut.
Listen around the change
Loop a short section before and after the edit at a sensible monitoring level. Check the transition, word attack and background continuity. Compare in context as well as at extreme zoom, because a visually neat waveform can still sound unnatural.
Export a short proof with the actual audio settings and listen outside the editor. If the edit sits near a picture event, confirm that the intended sync remains intact. Keep a version or undo point so the adjustment can be compared rather than relying on memory.
A short fade at a cut
A dialogue edit clicks at the boundary. Instead of shifting the whole sentence by one 40 ms video frame, inspect the cut and test a small appropriate fade or keyframe adjustment at finer timing. Listen to the complete word and the surrounding room tone. The goal is a clean transition without softening an important consonant or changing sync.
Before you act
- Distinguish keyframe edits from clip movement.
- Listen in a loop and in context.
- Check the exported proof and picture sync.
Use the Audio file size calculator to apply the guide to your own setup.
Keep exploring
- Distinguish dual mono, stereo and a missing dialogue channel
- Calculate PCM audio storage with channels, sample rate and bit depth
Sources and research notes
Research checked on 21 October 2026. Product specifications are manufacturer statements; examples and buying judgements are our analysis. No hands-on product test is implied.
Build on what you just learned
Your next useful step.
Check channels, loudness and peak headroom.
Distinguish dual mono, stereo and a missing dialogue channel
Inspect channel content and the recipient’s required routing. Two channels can contain a stereo scene, two independent microphones or one useful signal plus silence.
Read the guide →
Clean dialogue without making the room pump between words
I would begin with a clean recording and restrained processing, then compare at matched listening level.
Read the guide →