How to Do Audio Ducking in DaVinci Resolve (Step-by-Step)

Background music that drowns out your narration is one of the most common audio problems in video editing. Audio ducking solves it by automatically lowering music volume whenever dialogue or voiceover plays, then bringing it back up during pauses. DaVinci Resolve supports several ways to achieve this, from professional sidechain compression in Fairlight to simple keyframe automation on the Edit page. This guide walks through each method so you can pick the right one for your project.

What Is Audio Ducking and Why It Matters

Audio ducking is the technique of automatically reducing background music volume when a voice track is active, then restoring it when the voice stops. The result is a polished, broadcast-style mix where dialogue always sits clearly on top of the music without constant manual volume edits. Ducking works best when your dialogue recording is clean and consistent from the start. If your voice track is uneven or noisy, the compressor has to work harder and the effect can sound unnatural. A wireless mic with 32-bit Float recording and built-in AI noise cancellation, like the Hollyland LARK MAX 2, gives you a cleaner signal that responds more predictably to sidechain ducking.

Method 1 — Sidechain Compression in Fairlight (Recommended)

Sidechain compression is the most professional and scalable approach to audio ducking in DaVinci Resolve. Instead of drawing volume changes by hand, you route the dialogue track as a trigger signal into a compressor on the music track. When the voice gets loud, the compressor automatically pulls the music down. This method works reliably across long projects, podcasts, course videos, and anything with frequent dialogue.

Step 1 — Set Up Your Tracks in Fairlight

1. Click the Fairlight tab at the bottom of the DaVinci Resolve interface to switch to the Fairlight page.

2. Confirm your dialogue or voiceover is on a dedicated audio track, separate from your background music. If they are on the same track, separate them now.

3. Label the tracks clearly. Right-click each track header and rename them something like “Dialogue” and “Music” so the routing steps below are easier to follow.

4. If you have multiple music tracks, route them to a single bus first. Go to Fairlight > Create Bus, assign your music tracks to it, and you can compress the bus rather than each track individually.

Step 2 — Open the Dynamics Panel on the Music Track

1. On the music track header in Fairlight, click the Dynamics button. It typically appears as a small waveform or dynamics icon in the track channel strip. Alternatively, go to Mixer, find the music channel, and click Dynamics.

2. The Dynamics panel opens. Locate the Compressor section and enable it by clicking its power button or toggle.

3. Set your starting compressor parameters:

Start with these values and refine after you preview the timeline. The threshold setting is project-specific and depends on the loudness of your voice track.

Step 3 — Enable Sidechain and Route the Dialogue Track

1. Inside the Compressor section of the Dynamics panel, look for the Sidechain option. It may appear as a tab, a toggle, or a dropdown depending on your version of DaVinci Resolve.

2. Enable the sidechain input.

3. From the sidechain source dropdown, select your Dialogue track or the bus you assigned it to.

Screenshot placement: Capture the Dynamics panel with the Sidechain source dropdown open and the Dialogue bus selected. This is the step where most users get lost.

What you have now set up is a compressor that monitors the level of the dialogue track instead of the music track. When the voice signal crosses the compressor threshold, it triggers gain reduction on the music. The music track’s audio content is not used to trigger compression at all, only to be compressed.

Step 4 — Adjust and Preview

1. Press play and watch the gain reduction meter inside the Dynamics panel. You should see it moving whenever the dialogue is active.

2. If the music is not ducking, raise the threshold slightly or verify the sidechain routing in Step 3.

3. If the music recovers too abruptly between sentences, increase the Release value to 300–500 ms for a smoother fade-back.

4. If the ducking feels too aggressive, lower the Ratio to 3:1 or soften the threshold.

Fine-tuning tips: - Aim for 6–10 dB of gain reduction during speech for a natural result - Preview at least 30 seconds of dialogue with varied pacing to catch any edge cases - Reduce Attack slightly if the first syllable of each sentence is clipping over the music

Method 2 — Manual Keyframe Automation on the Edit Page

For short clips, simple projects, or situations where you want precise control over every individual volume dip, manual keyframe automation on the Edit page is a faster and equally valid approach. No routing or Fairlight knowledge is required.

How to Add Volume Keyframes to Your Music Track

1. In the Edit page, locate your music clip on the timeline.

2. Click the small curve or diamond icon on the music clip, or right-click the clip and choose Show Curve Editor to reveal the volume automation line.

3. Using the Selection tool, click directly on the volume line at the point just before your voiceover begins. This creates a keyframe.

4. Add a second keyframe a few frames later, then a third keyframe just before the voiceover ends, and a fourth keyframe a few frames after it ends.

5. Select the two middle keyframes (the ones inside the voiceover section) and drag them down to your desired reduced volume, typically around -12 to -18 dB below the original level.

6. Adjust the bezier handles on the outer keyframes to create gradual fade-in and fade-out curves rather than abrupt volume jumps.

7. Repeat this process for each section of voiceover in the timeline.

When to Use Keyframes Instead of Sidechain

Use keyframe automation when your project is short, your dialogue sections are few and predictable, or when you want to control the exact depth and shape of every individual dip. Use sidechain compression when your video is long, dialogue is frequent and varied, or you want a result that does not require updating every time you trim or rearrange clips.

Method 3 — Auto Duck Feature (DaVinci Resolve 19+)

DaVinci Resolve 19 introduced a built-in Auto Duck function that handles basic ducking automatically from the Edit page. To use it:

• Right-click your music clip on the Edit page timeline

• Look for the Auto Duck option in the context menu (location may vary by version)

• Select it and DaVinci Resolve will analyze the surrounding tracks and apply volume automation to the music clip

• NOT WORKING

• Go to the Fairlight page and right-click the music track. The Audio section should appear in the Inspector panel.

• Activate the Ducker option. In the source, select your Dialogue clip.  

• Set your duck level. This option is best if you’re working on longer projects. 

Limitations to be aware of: - Offers significantly less parameter control than Fairlight sidechain compression - Results may need manual cleanup on complex timelines - Best suited for beginners or quick single-clip edits

If you are on DaVinci Resolve 19 or newer and need a fast result without diving into Fairlight, Auto Duck is worth trying first. If the result sounds unnatural, switch to the sidechain method.

Common Audio Ducking Problems and Fixes

• Music does not react to the voice at all: The sidechain source is not correctly routed. Go back to the Dynamics panel, confirm the Sidechain toggle is enabled, and verify the correct dialogue track or bus is selected as the source.

• Ducking sounds choppy or pumping: The Release time is too short. Increase it to 300–500 ms to let the music recover more gradually between words and sentences.

• Music dips even during silence: The Threshold is too low. Raise it gradually until the compressor only triggers on clear speech, not on room noise or breaths.

• Volume keyframes will not snap to the correct position: Enable Snapping in the Edit page toolbar, or zoom in on the timeline for more precise keyframe placement.

• Fairlight Dynamics panel is grayed out: The track is not active or the Dynamics module is not enabled. Click the track to make it the active selection and confirm the Dynamics section is toggled on inside the Fairlight Mixer.

FAQ — Audio Ducking in DaVinci Resolve

Q1: Does DaVinci Resolve have automatic audio ducking?

Yes. DaVinci Resolve 19 introduced an Auto Duck feature accessible from the Edit page by right-clicking a music clip. For earlier versions, sidechain compression in Fairlight achieves the same effect with more precise control over compressor parameters. Both approaches are built into the software with no third-party plugins required.

Q2: What is the difference between audio ducking and sidechain compression?

Audio ducking is the audible effect: music lowers when a voice is present. Sidechain compression is the primary technique used to create that effect. In DaVinci Resolve’s Fairlight page, setting up a sidechain-triggered compressor on your music track is the standard way to achieve dynamic, automatic ducking.

Q3: Can I do audio ducking on the Edit page without going to Fairlight?

Yes. You can draw volume keyframes directly on the music clip in the Edit page timeline to create manual dips aligned with your voiceover sections. This requires no routing setup and works in all versions of DaVinci Resolve, though it is a static, manual process rather than a dynamic automatic one.

Q4: What compressor settings should I use for audio ducking in DaVinci Resolve?

Start with a Ratio of 4:1, Attack of 10–20 ms, and Release of 200–400 ms. Set the Threshold until the music clearly reduces during speech. Increase Release to 300–500 ms if recovery sounds abrupt. These are starting points; adjust based on your specific dialogue pacing and music loudness.

Q5: Why is my background music not ducking even after setting up sidechain?

The most common cause is an incorrect sidechain source assignment. Confirm the dialogue track is routed to a bus and that the same bus is selected as the sidechain input inside the Fairlight Dynamics Compressor panel. Also verify the Sidechain toggle itself is switched on, not just the compressor.

Conclusion

For most projects, start with the sidechain compression method in Fairlight. It is the most reliable approach and scales to any project length without extra manual work. If your project is short or you need quick results, keyframe automation on the Edit page gets the job done without any routing setup. Try both methods on a short test sequence before committing to a full project mix. Starting with a clean, even dialogue recording, such as one captured with a 32-bit Float wireless mic, will make your ducking results noticeably more natural regardless of which method you choose.

Related reading: - Fairlight Audio Mixing Basics in DaVinci Resolve - DaVinci Resolve Audio Workflow: Edit Page vs. Fairlight - How to Use Bus Routing in DaVinci Resolve Fairlight