> ## Documentation Index
> Fetch the complete documentation index at: https://docs.premierecopilot.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Auto Mix
> AI sound-engineer mix of your whole timeline — levels, EQ, compression, de-noise and music ducking under the voice.
Auto Mix listens to every audio clip in your sequence and mixes it like a sound engineer would: it sets each source to a proper loudness target, cleans up the voice, leaves the music alone but puts it at the right level, and rides the music down under every line of dialogue.
Everything is applied as **real, editable effects** on your clips — nothing is baked in.
Auto Mix is a **Premiere Pro** feature. It is not available in DaVinci Resolve.
## Quick Start
Open the **Tools Menu** and select **Auto Mix**.
Type your instruction in the **prompt box** at the bottom of the panel — e.g. *"clean podcast mix, keep the music well under the dialogue"*. Optional, but this is where most of the control lives.
Leave **Time Start** and **Time End** empty to mix the whole timeline.
Click **Start Auto Mix**. Count roughly **one minute per hour of timeline**.
## What it actually does
Auto Mix works in two passes, and knowing the difference explains most of the results.
Each source clip is identified as **speech**, **music** or **SFX**, then given its own treatment: level, high-pass, compression, de-noise, de-ess, limiter — only what that clip actually needs.
Wherever a music or SFX bed overlaps speech, a smooth **volume automation** is written on the bed: it dips before the line starts, holds under it, and comes back up after.
### Level targets
Levels are set relative to a delivery standard, with the **voice as the anchor** and everything else placed below it:
| Delivery | Speech anchor |
| -------------------------------- | ------------- |
| **Podcast / voice** (default) | -16 LUFS |
| **YouTube / streaming / social** | -14 LUFS |
| **Broadcast / TV / EBU R128** | -23 LUFS |
Music sits clearly below the voice and is ducked further under it; SFX land in between.
Just name your platform in the prompt — *"master for YouTube"*, *"broadcast delivery"* — and the whole mix re-anchors around it. That single word does more than any manual gain pass.
### Processing philosophy
* **Voice gets the work.** High-pass to remove rumble, compression only when the delivery is genuinely uneven, de-noise only when there's a real noise floor, de-essing only when it's actually sibilant.
* **Music is left alone.** A music bed is already produced and mastered, so it gets a **level and nothing else** — no EQ, no compression. Only its volume moves.
* **SFX stay minimal.** Level, and a limiter if a peak demands it.
Nothing is applied "just in case". If your voice track is clean and even, you'll get a gain change and a high-pass, and that's it — that's the correct mix, not a missing one.
## Settings
| Setting | What it does |
| ------------------ | -------------------------------------------------- |
| **Prompt box** | Free-text instruction. Overrides the defaults. |
| **Time Start (s)** | Apply the mix only to clips at or after this time. |
| **Time End (s)** | Apply the mix only to clips up to this time. |
**The time range limits where the mix is applied, not what is analysed.** The analysis always reads the whole timeline, so a range still gets levels consistent with the rest of your sequence. This is deliberate — mixing a 30-second window in isolation would make it jump against its neighbours.
Use the range to fix one problematic section after a first full pass, rather than re-mixing everything.
## Writing a Good Prompt
The prompt is optional, but it's how you set intent. Describe the **result you want to hear**, not the parameters.
### What works
* **The delivery target:** *"Master for YouTube."* / *"Broadcast delivery, EBU R128."*
* **The music/voice balance:** *"Keep the music very low under the dialogue, it should barely be there."* / *"The music can stay present between the lines."*
* **The overall character:** *"Clean, neutral podcast mix."* / *"Punchy and loud, energetic edit."* / *"Natural and dynamic, don't squash it."*
* **A known problem with the recording:** *"There's air conditioning in the background, clean it up."* / *"I'm sibilant, tame the S sounds."* / *"My delivery goes from whisper to shout, even it out."*
* **What to protect:** *"Don't touch the music, only fix the voice."* / *"Don't over-compress, keep the dynamics."*
* **Ducking behaviour:** *"Duck the music hard under every line."* / *"Only light ducking, this is a music-led video."*
### What doesn't work
* **Per-clip instructions.** *"Lower the third clip by 3 dB"* is a local retouch — do it by hand, or ask the Copilot for that single clip. Auto Mix is a whole-timeline pass.
* **Timecodes.** *"Boost the intro at 0:15"* — use the Time Start / Time End fields instead.
* **Creative sound design.** No reverb, delay, pitch, telephone effect, or vocal character processing. This is a mix, not a design pass.
* **Fixing the recording itself.** De-noise reduces a noise floor; it doesn't remove a passing motorbike, a clipped peak or a room with bad acoustics.
* **Renaming or re-classifying a clip.** If a clip is misread as music, say so in words (*"the file called 'ambience' is dialogue"*) rather than expecting a setting.
* **Asking for a specific dB number per effect.** Say what you want to hear; the target does the rest.
### Recommended pattern
> *"\[Delivery target]. \[Voice/music balance]. \[Known problem to fix]. \[What to leave alone]."*
**Example:**
> *"Podcast mix for Spotify. Music clearly under the voice, ducked hard on every line. There's a constant hum in my mic — clean it. Don't over-compress, I want the delivery to breathe."*
If the first pass isn't right, change **one** thing in the prompt and re-run rather than rewriting the whole instruction — it's much easier to tell what moved.
## After the run
The mix arrives as standard Premiere audio effects on your clips — volume, high-pass, compressor, de-noise, de-esser, limiter — plus volume keyframes on the ducked beds.
That means you can:
* **Adjust anything by hand** in the Effect Controls panel.
* **Reshape a duck** by dragging its keyframes.
* **Remove a treatment** you disagree with, clip by clip.
* **Undo the whole thing** with Cmd/Ctrl+Z.
Listen on the monitoring you actually deliver on. A mix anchored at -16 LUFS is correct even if it feels quiet next to a loud reference track in another app.
## Common Pitfalls
* **All audio on one track** → clips still get treated individually, but a voice and a music bed sharing a track make classification harder. One source type per track gives the best result.
* **A music bed that never ducks** → it probably wasn't read as music. Say what it is in the prompt.
* **Nested sequences or multicam** → the audio inside them can't be analysed as separate sources. Flatten first.
* **Already-processed clips** → Auto Mix adds its own effects on top of yours. Remove your previous audio effects before running, or the two stack.
* **Expecting a repair tool** → de-noise handles a steady noise floor. Clipping, wind blasts and room reverb are recording problems it cannot undo.
* **Touching the timeline mid-run** → let it finish; it's reading and writing your sequence.
**Recommended workflow:** one source type per audio track → a two-sentence prompt naming your platform and the music/voice balance → full-timeline pass → listen → fix any single section with a Time Start / Time End re-run.