CapCut auto-duck BGM under voiceover (2026)
Keyframes or auto-duck so narration stays readable.
Place voiceover first, then drop BGM and enable ducking or keyframe dips under lines.
Keep dips 3–6 dB so music stays present without masking consonants.
Align duck starts a beat before speech; abrupt cuts feel like a glitch.
Export a 10-second preview on phone speakers—earbuds hide ducking mistakes.
Save the duck pattern as a preset when you reuse the same show format.
Change one variable at a time and confirm what actually helped.
If a company policy is involved, rule that out before chasing client settings.
Write the working steps into a short checklist for next time.
Export or screenshot a good setup so reinstalls are faster.
If it still flakes, retest on a clean network such as phone hotspot.