How to Prepare Your Music for Mastering: A Complete Guide for Artists, Producers & Labels

Preparing your music for mastering is one of the most important steps in the entire release process. A great master starts long before any EQ, compression, or limiting happens - it starts with how you deliver your mix.

At Mastering Alliance™, we work with artists, producers, and labels every day, and we’ve seen the same issues repeatedly slow down releases or compromise the final sound. This guide walks you through everything you need to know to prepare your music properly, avoid delays, and get the best possible master.

1. Supply High‑Quality, Lossless Audio Files

For professional audio mastering, always export your mix in a lossless format.

Recommended file format (minimum requirements):

• WAV or AIFF

• 44.1 kHz / 24‑bit or higher

Avoid MP3s or other compressed formats — they remove detail and limit what a mastering engineer can do. If an MP3 is all you have, it can still be mastered, but it won’t achieve the same clarity or depth as a lossless file.

2. Leave Proper Headroom for Mastering

Headroom is essential. If your mix peaks at or near 0 dB, the mastering engineer has no space to apply EQ, compression, or limiting without distortion.

Industry standard headroom for mastering:

Aim for around –6 dB peak level.

This doesn’t make your track quieter in the final release — it simply gives the mastering engineer clean, unclipped audio to work with.

3. Remove Limiters and Master Bus Processing

This is one of the most common issues we see. This topic often sparks debate within professional audio circles. What follows is the reality as we’ve experienced it through many years of high‑level mastering work.

Before exporting your mix, remove:

• Limiters

• Master bus compressors

• Maximisers

• “Mastering chains” or loudness plugins

If you’ve created your own “demo master,” feel free to send it as a reference track, but the file for mastering must be clean.

4. Don’t Apply Dither - Leave That to Mastering

Dithering is not something you should apply during mixing - it’s a creative and technical choice made at the mastering stage.

Different dithering algorithms have different tonal characteristics, noise‑shaping curves, and behaviours, and they can subtly influence the feel of a track. Our engineers use a wide range of high‑quality dithering tools and select the one that best complements the song’s vibe, genre, and dynamic profile.

Simply export your mix at its native bit depth with no dither applied, and we’ll choose the most suitable option during mastering.

5. Clean Up Pops, Clicks & Edits Before Mastering

Mastering is not the stage to fix editing issues. Before exporting your mix:

• Remove pops and clicks

• Fix any harsh edits

• Ensure fade‑ins and fade‑outs are smooth

These issues are best handled in the mix, not during mastering. Our engineers will do their best to assist if you are unable to fix some of these issues.

6. Leave Space at the Start and End of Your Track

Don’t trim your mix too tightly. Leave a little room before the first transient and after the final tail so the mastering engineer can shape the ending naturally.

7. Don’t Send Session Files - Only a Stereo Mix

Mastering is not mixing. Your mastering engineer works with your stereo mix, not individual stems or project files.

If something in the mix needs attention — harsh sibilance, muddy low end, overly bright vocals — your engineer will let you know so you can revise and resend.

8. Send Reference Tracks (Optional but Helpful)

Reference tracks help your mastering engineer understand your sonic goals.

Good reference tracks include:

• Songs with the loudness you want

• Tracks with a similar tonal balance

• Mixes that match your artistic direction

MP3 references are fine - they’re for context, not processing.

9. Understanding ISRC Codes for Mastering

ISRC codes are unique identifiers used for:

• Streaming

• Radio play

• Royalty tracking

• Digital distribution

Most independent artists receive ISRCs automatically from their distributor (DistroKid, TuneCore, CD Baby, etc.).

You only need to supply ISRCs before we create MP3s for radio (i.e. promoting your single ahead of official release) or before CD/vinyl manufacturing.

10. Preparing for CD & Vinyl Mastering

If you’re releasing physical formats, mastering requirements differ slightly.

CD Mastering Requirements

• ISRC codes

• UPC/EAN barcode

• DDP file (most manufacturers require this, although many nowadays prefer working with WAV files)

Some plants accept WAVs, but DDP is the industry standard. We provide DDPs on request alongside your individual mastered WAV files. A DDP serves as a quality‑assured, engineer‑certified format that ensures full compliance for CD manufacturing.

Vinyl Mastering Requirements

• ISRC codes

• UPC/EAN barcode

• Track sequencing notes (recommended) - best to supply SIDE A plus SIDE B sequencing notes

Even though vinyl is analogue, ISRCs are still required for rights management.

11. Apple Digital Masters (ADM)

Apple Digital Masters (formerly MFiT) is an optional format optimised for Apple Music.

You don’t need ADM to release on Apple platforms — it’s simply an enhanced version. Check whether your distributor supports ADM before requesting it.

12. Let Us Know in Advance if You Need Alternate Versions

If you require additional versions of your track - such as an instrumental, radio edit, performance version, TV mix, or acapella - please let us know before the mastering session begins.

Each version needs to be mastered individually to ensure consistent loudness, tonal balance, and translation across all formats. Being clear upfront allows us to plan the session properly, maintain cohesion between versions, and deliver everything you need without delays.

Final Thoughts: Get the Best Results from Your Mastering Session

Preparing your music properly ensures:

• Better‑sounding masters

• Faster turnaround

• Fewer revisions

• A smoother release process

At Mastering Alliance™, our engineers specialise in professional audio mastering for streaming, CD, and vinyl. If you’re unsure about anything — file formats, ISRCs, physical releases, or technical requirements — we’re here to help.

Have a question about this blog, or need any assistance?

Get in touch: contact@masteringalliance.com