Quick answer: Voice Isolation separates a recorded human voice from competing sound; Dialogue Leveler rides loud dialogue down and soft dialogue up. Voice Isolation requires DaVinci Resolve Studio, while Dialogue Leveler is available on desktop in both Free and Studio. Match obvious clip-gain differences first, isolate only when noise masks speech, level second, then EQ or compress only if the mix still needs it.
These tools are often enabled together because they sit close to each other in the Audio Inspector. That doesn't make them interchangeable. If the problem is an air conditioner, crowd, traffic, or room sound, test Voice Isolation. If the speaker turns away from the microphone or two people land at different levels, test Dialogue Leveler. If only two words are wrong, manual gain is usually cleaner than either.
Voice Isolation vs Dialogue Leveler
| Tool | Problem it solves | Controls | Edition |
|---|---|---|---|
| Voice Isolation | Background ambience, noise, music, reverb, or competing sound around a voice | Enable and Amount 0–100% | Studio |
| Dialogue Leveler | Speech that varies too much between phrases or speakers | Preset, Reduce Loud Dialogue, Lift Soft Dialogue, Background Reduction, Output Gain 0 to +6 dB | Free and Studio |
| Clip gain / automation | A few predictable level jumps or words needing editorial judgment | Clip gain, keyframes, fader automation | Free and Studio |
| Compressor | Remaining dynamics needing threshold-, ratio-, and timing-based control | Threshold, ratio, attack, release, makeup gain | Free and Studio |
The final July 2026 DaVinci Resolve 21 Reference Manual labels Voice Isolation as Studio-only, documents Dialogue Leveler without that restriction, and defines the current controls, channel limits, and live-input boundary used below. Blackmagic’s latest Fairlight overview places both tools inside the wider clip, track, bus, repair, and mixing workflow.
What Voice Isolation Actually Does
Voice Isolation uses an AI model trained for human voices to separate recorded speech from competing sound. Amount is a wet/dry blend: at 50, the original and isolated voice are roughly equal. Blackmagic recommends 70–80 as a useful natural-sounding range while strongly isolating the source, but that's a starting range, not a target every recording should reach. Push only until the background stops masking the words.
Voice Isolation can run on existing mono, stereo, or dual-mono clips and tracks. It isn't supported on tracks with more than two channels and cannot process live audio input. It is trained for human voice, not as a general music stem separator; a siren over a consonant, clipped speech, lyrics, or another speaker at the same time may leave no clean information to recover.
I audition the hardest line, raise Amount until the background stops competing, then compare bypass at matched loudness. A small bed of stable ambience often sounds more believable than silence opening and closing between syllables. A recent Resolve editor discussion of crowd and applause removal shows both sides of the tradeoff: speech can become dramatically clearer, while removing contextual sound such as clapping can make the scene feel wrong. That's directional listening evidence, not a replacement for the manual or a universal Amount setting.
What Dialogue Leveler Actually Does
Dialogue Leveler analyzes dialogue, rides louder areas down, lifts softer areas, and can lower background it classifies as non-dialogue. It aims for the result of detailed clip-gain or fader work without forcing you to draw every move, while preserving more of the original relative dynamics than simply crushing the track with a limiter.
The real controls matter:
- Preset: Allow wider dynamics (the default), More lift for low levels, Lift soft whispery sources, or Optimize moderate levels. Pick for the source range; do not treat the menu as a quality ladder.
- Reduce Loud Dialogue: rides peaks in louder speech downward.
- Lift Soft Dialogue: raises low-level speech; it can also make breaths, mouth noise, and coincident background more noticeable.
- Background Reduction: gently lowers non-dialogue sound according to the analysis and preset. It isn't the same separation process as Voice Isolation.
- Output Gain: adds 0 to +6 dB after leveling. It isn't a target-loudness control.
Dialogue Leveler can preserve perspective better than aggressive compression, but it still needs boundaries. A wide shot may be intentionally more distant than a close-up. A whisper and a shout should not always become identical. For fully manual dynamics control, use our Fairlight dialogue compressor guide.
Where to Find the Controls
On the Cut, Edit, or Fairlight page, select an eligible mono, stereo, or dual-mono audio clip and open Inspector, then Audio. For track-wide treatment, open the Fairlight Mixer and use Track FX. Voice Isolation and Dialogue Leveler occupy fixed dedicated Track FX points and are visible by default; other Track FX appear through the mixer menu. Dialogue Leveler’s scrolling waveform display is available in the track plugin, not the clip Inspector version.
Clip processing is safer when only a few shots have noise or level problems. Track processing is convenient when one microphone and environment remain consistent. Don't apply a track-wide setting to a lane that mixes lavs, booms, phone recordings, and room tone unless you've auditioned every transition.
Best Processing Order When You Need Both
- Listen raw. Mark noise, level jumps, clipping, overlap, and unusable words across the entire scene.
- Edit first. Choose the cleaner microphone or take, remove covered words where possible, and split clips when conditions change radically.
- Match gross clip gain. Bring edit-to-edit differences into the same working neighborhood without flattening performance.
- Apply Voice Isolation only where needed. Raise Amount until the noise stops masking speech, then back off if the voice loses texture.
- Add Dialogue Leveler. Start with the default Allow wider dynamics preset after establishing a sensible baseline, or choose the preset that matches the source. Enable only the modules that solve a heard problem; Output Gain isn't a target-loudness control.
- Shape tone. Use the steps in our dialogue EQ guide after restoration so you're not boosting noise the isolation stage will later remove.
- Control remaining dynamics. Add light compression or automation only if the leveler hasn't already done enough.
- Mix in context. Restore room tone, music, and effects around the cleaned voice.
- Measure the final bus. Use the LUFS and true-peak workflow after all processing.
This order is a reliable starting point, not a law. Voice Isolation and Dialogue Leveler use fixed dedicated Track FX positions; ordinary mixer inserts can still be reordered around the wider chain. A difficult source may respond better to clip automation instead of Dialogue Leveler or to a corrective filter elsewhere in the chain. Change one stage at a time and compare at matched loudness.
Clip-Level or Track-Level Processing?
| Scope | Use it when | Risk |
|---|---|---|
| Clip | Noise, mic position, or speaker changes between edits | Different settings can make room tone jump at every cut |
| Track | One consistent microphone, speaker, and environment | A single setting may overprocess exceptional clips |
| Split tracks | Boom, lav, phone, ADR, and narrator need separate treatment | More routing work, but clearer control and automation |
If you split speakers or microphones across tracks, name and color them before adding effects. Keep dialogue, room tone, music, and effects on intentional buses; our Fairlight bus-routing tutorial prevents a cleaned voice from accidentally feeding the wrong print master.
How to Compare Without “Louder Is Better” Bias
Processing often raises output. A louder result can feel clearer even when it has more artifacts. Toggle bypass on the same phrase and compensate the output or monitor level so the perceived loudness is close. Listen for consonant edges, sibilance, room tails, breaths, and the boundary between speech and silence.
Test four places, not one easy loop: the noisiest sentence, the softest line, a loud line, and an edit where the microphone or room changes. Then render the hardest 20–30 seconds and listen outside Resolve on headphones, speakers, and a small mono-compatible device.
When Neither Tool Is the Right Fix
- Clipped recording: isolation cannot restore harmonics that the recorder flattened.
- Covered speech: a horn, clap, or second voice may occupy the same time-frequency region as the word.
- Very distant microphone: removing room sound doesn't create the direct-to-reverberant ratio of a close mic.
- A few bad words: clip gain or automation is faster and more transparent.
- Music or effects: these dialogue tools can mistake sung or speech-like material for the target.
- Mixed program master: process dialogue stems before the final mix whenever possible.
For missing or covered words, alternate takes, lav/boom choice, ADR, captions, or an editorial rewrite may be more honest than extreme restoration. The goal is intelligibility without pretending the source contains information it does not.
Free vs Studio: The Correct Answer
On desktop, Dialogue Leveler works in DaVinci Resolve Free and Studio. Voice Isolation is Studio-only. The free edition still includes clip gain, automation, EQ, standard dynamics, routing, and loudness monitoring, so a careful manual chain can produce professional dialogue without pretending the two AI-assisted tools share the same license boundary.
Dialogue Separator is another, different Studio tool that offers separate dialogue, background, and ambience controls. Don't confuse it with Voice Isolation or the level rider described here.
Troubleshooting Artifacts
The voice sounds watery or robotic
Reduce Voice Isolation Amount, split the difficult section, and leave more stable room tone. Severe reverb, wind, clipping, or overlapping sources may not separate cleanly.
Breaths and mouth noise surge
Turn down or disable Lift Soft Dialogue for that clip, correct the phrase manually, and automate the offending events. Raising quiet speech can expose every quiet non-speech detail near it.
Noise changes at every edit
Use different clip-level settings for different microphones and locations, then bridge cuts with matching room tone and short crossfades. One track-wide value cannot make unrelated rooms identical.
Dialogue Leveler pumps
Match clip gain first, choose a gentler preset, and inspect compressors or limiters later in the chain. Stacking two aggressive level-control stages can exaggerate movement.
The last word is cut or fades strangely
Extend clip handles if media exists, remove an abrupt edit boundary, and retest without isolation and leveling. Some analysis needs context around the phrase; a hard cut through a breath or reverb tail can sound like processing failure.
The processed export differs from playback
Render a short WAV test from the correct bus, reimport it, and compare phase, channel layout, and level. Our audio export checklist covers bus and channel-selection mistakes.
Final Dialogue QA
- Listen to every processed edit at normal speed.
- Compare bypass at matched loudness.
- Check breaths, S sounds, plosives, and word endings.
- Listen for ambience opening and closing around speech.
- Confirm intentional distance and performance dynamics remain.
- Check downstream EQ, compression, limiter, and bus routing.
- Render and reimport the hardest passage.
- Measure final loudness and true peak only after the mix is complete.
Voice Isolation should make the background less distracting. Dialogue Leveler should make the performance easier to follow. If the tool itself becomes the first thing you hear, it is doing too much.
Use the DaVinci Resolve Fairlight audio hub to connect cleanup with routing, EQ, compression, export, and loudness checks. For licensing decisions outside this pair of tools, continue with the DaVinci Resolve Free vs Studio comparison.
Voice Isolation vs Dialogue Leveler FAQ
What is the difference between Voice Isolation and Dialogue Leveler?
Voice Isolation separates a recorded human voice from competing sound. Dialogue Leveler rides louder dialogue down, lifts softer dialogue, and can reduce some non-dialogue background for a more consistent level.
Is Dialogue Leveler available in DaVinci Resolve Free?
Yes. Dialogue Leveler is available on desktop in both Resolve Free and Studio. Voice Isolation requires Resolve Studio.
Which tool should go first?
When both are needed, match large clip-gain differences first, apply Voice Isolation conservatively, then use Dialogue Leveler. Treat that order as a starting point and compare the full chain at matched loudness.
Can Voice Isolation remove wind and crowd noise?
It can reduce them when the speech remains recoverable. It can't reliably reconstruct words covered by strong gusts, clipping, applause, or another voice.
Why does Dialogue Leveler raise breaths and room noise?
Lift Soft Dialogue raises quiet detected material, and noise occurring with speech may rise too. Reduce that module or correct the phrase manually; Output Gain changes level after processing and isn't a loudness target.
Should I still use a compressor?
Only if the dialogue needs additional controlled dynamics after clip gain and leveling. Start gently and check that the compressor isn't exaggerating pumping or breaths.
Can I apply these tools to an entire track?
Yes, on eligible mono, stereo, or dual-mono tracks, but not live audio input or tracks with more than two channels. Track processing is safest when the microphone, speaker, and room stay consistent.
Related guides
- Fairlight Audio in DaVinci Resolve: the hub: the full audio cluster.
- How to Remove Background Noise in DaVinci Resolve: the wider noise toolbox both tools belong to.
- DaVinci Resolve No Audio: when the problem is silence, not noise.
