GUIDE / 03 Recording · Release

Mixing versus mastering: what each stage needs

Understand the separate decisions, files and approvals involved in mixing and mastering before approaching an engineer.

THE SHORT ANSWER

Start here

Mixing shapes the balance and treatment of the recorded parts and produces an approved final mix. Mastering starts from that approved mix and prepares the finished recording or release sequence for its intended distribution formats. Do not use mastering to postpone unresolved mix decisions, and do not prescribe an internet loudness number without discussing the music, format and distributor requirements with the engineer.

Decide these before you shortlist providers.

  1. 01

    Are editing, comping, tuning and production effects complete before mixing?

  2. 02

    Who approves the mix and how many consolidated feedback rounds are expected?

  3. 03

    Which masters are needed for digital, vinyl, CD, video or immersive delivery?

  4. 04

    Will one engineer handle both stages, or will separate engineers exchange files?

What belongs in the mix

The mix is where the recorded elements become one approved musical presentation.

Session preparation

Confirm editing, comping, tuning, noise repair, track naming and arrangement decisions. State clearly if the mixer is expected to perform any of that work.

Creative direction

Explain priorities and references in practical terms: vocal position, drum impact, guitar density, ambience, dynamics and the relationship between sections.

Feedback route

Collect one consolidated set of timestamped comments from the real decision-makers. Separate corrections from new creative directions.

Approval

Approve the final mix as the source for mastering. Keep alternate, instrumental, clean or performance versions explicit rather than discovering them after delivery.

What belongs in mastering

Mastering prepares the approved mix for a finished release and its specified destinations.

Format brief

List the required digital, physical, video and alternate masters. Ask the chosen mastering engineer and manufacturer for their current file requirements.

Release sequence

For an EP or album, provide the order, spacing intentions and any transitions that matter across tracks.

Quality control

Supply correct titles and version names, then verify the delivered files, starts, ends, fades, channels and identifiers before distribution.

Revisions

A mastering revision can address the master; a fundamental balance problem may need to return to the mix. Agree how that handback is handled.

Prepare a clean handoff

Ask each engineer for their exact specification. The following information makes that conversation useful without inventing a universal template.

Files

State sample rate, bit depth, channel format, start alignment and whether stems, instrumentals or alternates are required. Follow the receiving engineer’s instructions.

Documentation

Include track and version names, order, contact person, references, known technical issues and any approved processing that must remain.

Headroom and limiting

Do not remove creative processing or apply arbitrary technical targets by guesswork. Ask the mastering engineer what they need from this mix.

Version control

Use unambiguous filenames and one approved delivery location so an older revision cannot accidentally become the release master.

Treat loudness as a technical and artistic decision

Streaming services and delivery systems may normalise playback, but one number is not a complete mastering brief.

Artistic intent

Dynamics, density and impact are part of the record. Discuss how the music should behave rather than demanding the loudest possible file.

Destination

Music streaming, broadcast, video and physical formats can have different delivery contexts. Confirm the actual destinations.

Measurement

Loudness and peak measurements help quality control, but they do not replace listening, genre context or the mastering engineer’s judgement.

Documentation

Keep the final technical information with the delivered masters so later video, physical and archive work starts from the correct files.

Is the brief ready?

Use this list before requesting a quote. The chosen provider's current specification and professional advice still take priority.

  • All recording and intended production edits are complete or separately scoped.

  • The mixer has organised files, references and one decision contact.

  • Mix versions and revision rounds are agreed.

  • The final mix is approved before mastering begins.

  • Every required master format and alternate version is listed.

  • Track order, names, identifiers and version labels are consistent.

  • Technical delivery follows the receiving engineer’s current specification.

  • Final masters are listened to and checked before distribution.

Questions worth asking every shortlisted provider.

  1. 01

    Which preparation work is included before the first mix pass?

  2. 02

    How should feedback be delivered and consolidated?

  3. 03

    Which alternate mixes and masters are included?

  4. 04

    What exact files should move from mixing to mastering?

  5. 05

    Which distribution or manufacturing destinations affect the master set?

Sources behind this guide

External requirements can change. Open the current source before relying on a technical, platform or legal detail.

  1. 01
    LoudnessAudio Engineering Society

    Technical overview and standards references for loudness in production and distribution.

  2. 02
    Loudness normalizationAudio Engineering Society

    Explains normalization workflows and why uniform track targets can conflict with musical intent.