How to Prep a Session to Mix

Sending a messy session to a mixer is like handing someone a box of puzzle pieces with no picture on the lid. They can figure it out. It’ll just cost you time and money, and you’ll get a worse mix for it.

Good session prep is not busywork. It’s the difference between a mixer who spends the first two hours of a session doing your job for you, and one who opens the file and starts making creative decisions immediately.

Here’s exactly what to do before you send.

Why session prep matters

Mixers charge by the session, the day, or the hour. Time spent untangling your unconsolidated regions, renaming “Audio Track 47,” or hunting down a missing file is time not spent mixing. And if they’re on a flat rate, they’re going to factor that chaos into how much attention they give your project.

Beyond the economics: a clean session communicates that you know what you’re doing. It sets the tone for the collaboration. A mixer who opens a well-organized session trusts your work more, and that trust affects every judgment call they make.

Consolidate and trim your regions

This is the one that gets skipped most often, and it causes the most problems.

Consolidating means rendering each track as a single continuous audio file from the start of the session to the end — or at minimum, from the first region to the last. Every clip on a track gets baked into one file. No gaps, no missing audio, no “where does this region actually start” ambiguity.

Before you consolidate, trim your regions. Cut silence at the top and tail of clips where it doesn’t matter. But be careful: don’t trim so aggressively that you remove breaths, room tone, or any audio the mixer might want for transitions or fades. Leave a little breathing room at the head and tail of regions — a few hundred milliseconds at minimum.

After you consolidate, spot-check everything. Play through a few key sections and make sure the consolidation landed correctly. Export issues, clip gain baking, and automation rendering can all introduce problems at this stage.

Also: deal with your sample rate now, not at export. If your session is 48 kHz and you’ve got a 44.1 kHz file in there, handle the conversion before you hand it off. Do not let the mixer’s DAW do it on import.

Naming conventions and track organization

“Audio 1,” “Audio 2,” “New Track,” “FX FINAL v3 copy” — none of these are track names. They are admissions that you didn’t finish the job.

Name every track clearly and descriptively. Use a consistent format. A common approach for dialogue-heavy projects is CHARACTER_SCENE_TAKE — so ANNA_SC03_TK2. For music, KEYS_RHODES or GTR_DI_L. For effects, SFX_DOOR_SLAM or AMB_CITY_EXTERIOR.

Group and color-code by category. All dialogue tracks together, colored one color. Music stems, another color. SFX, another. Effects processing, another. The mixer should be able to understand the basic layout of your session in thirty seconds.

If you have parallel tracks, aux sends, or reference tracks, label those too. And delete anything you’re not sending — unused tracks, muted tracks that are genuinely dead, old versions sitting around. If it’s not part of the mix, it shouldn’t be in the session.

Track order

There’s a conventional order that most mixers expect, especially in post-production:

Dialogue
ADR
Voiceover / narration
Music
Sound effects
Backgrounds / ambience
Foley

In music sessions, the common grouping is drums, bass, guitars/keys, vocals, with aux and bus tracks at the bottom. Match what your mixer is likely to expect, or explain your layout in your handoff notes.

Checking for phase issues and dual mono files

Phase issues and dual mono files are two of the most common problems that slip through unchecked — and both can seriously affect the mix.

Phase

If you’ve recorded with more than one microphone or combined close and distant sources, check for phase relationships. A close mic and a room mic that are out of phase will cancel each other in mono. A direct and room guitar that are phase-reversed will sound thin and distant.

The quickest way to catch gross phase problems: flip your monitor to mono and listen. If something collapses or sounds hollow that shouldn’t, you have a phase issue. Fix it before you send — don’t leave it for the mixer to discover.

Dual mono

A dual mono file is an interleaved stereo file where both channels carry identical (or near-identical) audio. It looks like a stereo file in your session. Your DAW treats it like a stereo file. But it is not stereo — it’s a mono signal taking up twice the space and using twice the processing.

This shows up all the time with field recordings, broadcast-style camera audio, stock sound effects, and certain audio interfaces that record mono input to both channels by default.

The problem: if you hand this off to a mixer, they’ve got a stereo track where there should be a mono track. A stereo plugin chain on a dual mono track is wasting CPU. Panning decisions will be off. The session is bigger than it needs to be and harder to work with.

Check every interleaved stereo file in your session and confirm it’s actually stereo. If it’s dual mono, convert it to a true mono file and put it on a mono track.

With a small number of files, you can do this by ear or by eyeing the waveforms. With a large library of effects or a session built from hundreds of field recordings, that’s hours of work. MonoMate was built specifically for this: drag your files in, it analyzes the channels and identifies dual mono instantly, then converts them to true mono in one pass. Especially useful before a handoff when you’re going through your entire session folder.

Gain staging before you send

Your tracks should not be arriving at the mixer clipping. They should also not be arriving so hot that there’s no headroom to work with, or so quiet that the mixer has to add 20 dB of gain just to hear anything.

A reasonable target for individual tracks going to a mixer: peaks around -18 dBFS to -12 dBFS, with no sustained content above -6 dBFS. This leaves the mixer plenty of headroom.

If you’ve done any processing on the tracks — compression, EQ, saturation — think hard about whether that processing should be included. In most cases, send unprocessed (or lightly processed) audio unless the processing is intentional and part of the sound. If you’ve printed a heavily compressed drum bus because that’s the sound, fine — note it in your handoff notes. If you’ve got a heavy compressor on vocals because it was the only way to hear them during editing, bypass it before you send.

Clip gain adjustments are fine and encouraged. Use clip gain to normalize performance variations so the mixer isn’t constantly riding fader for level inconsistencies you could have fixed.

What to include in your handoff notes

A session without context is a puzzle. Handoff notes are the instruction manual.

Include at minimum:

Technical info

DAW and version used
Session sample rate and bit depth
Any third-party plugins used on print tracks (or: “all tracks printed clean, no plugins needed”)
Frame rate (for post-production work)

Creative context

What the project is: format, genre, intended platform
Any reference tracks you want the mix to aim for
Anything you’re particularly attached to that should be preserved
Anything you hate that should go away

Problem flags

Known issues — a performance that’s slightly out of tune, a take that has a noise problem, a section you’re unsure about
If you left a problem unfixed, say why

Deliverable specs

What you need back: format, bit depth, sample rate, stem breakdown if any
Deadline

The clearer your notes, the fewer emails you’ll exchange mid-mix. Every question the mixer has to send you is friction that slows the project down.

Checklist

Run through this before you hit send.

Files and regions

All tracks consolidated into single continuous files
Regions trimmed with appropriate head and tail room
No missing audio files — session opens clean
Sample rate consistent across all files

Organization

Every track named clearly and descriptively
Tracks grouped and color-coded by category
Track order follows a logical convention (dialogue, music, SFX, etc.)
Unused and dead tracks deleted

Audio quality

Phase checked in mono — no obvious cancellation
All stereo files verified as genuinely stereo (dual mono converted to true mono)
Gain staging set — peaks -18 to -12 dBFS on individual tracks
No clipping on any track
Intentional processing documented; non-essential processing bypassed

Handoff notes

DAW, sample rate, bit depth noted
Frame rate noted (if post-production)
Creative brief and reference tracks included
Known issues flagged
Deliverable specs clearly stated
Deadline confirmed