How to send music to a mastering engineer

A quick conversation before the export

The mix is finally approved. You are ready to send it for mastering, but now you are looking at the export window wondering which bit depth to choose and whether that limiter should stay on.

This is a good moment to ask the engineer. Confirm their preferred format, sample rate, bit depth and delivery method, along with the date, included revisions and files you will receive back. Asking is easier than exporting everything twice.

Mention instrumentals, clean edits, vinyl preparation or other requirements before the work starts. For an EP or album, send the proposed sequence too. Those carefully chosen gaps and transitions are part of the record, and the engineer should know which ones matter to you.

Be sure this is the mix you want mastered

A final master is a lovely thing to receive. It is less useful if, halfway through listening, you remember that the artist still has not chosen the chorus vocal. Resolve the important performance, arrangement and balance decisions first.

Name the exact approved mix and keep its source session available. That way, a small adjustment does not require a search through every bounce from the last month.

There is also room to be honest about uncertainty. “The last chorus feels dense; tell me if you would prefer a mix adjustment” is a helpful note. A stereo file does not offer the independent control of the session. Some problems are quicker and better to address while those individual parts are still available.

Keep the sound, explain the processing

Maybe the mix bus compressor has been there since day one. Maybe the final limiter was added last night so the review copy would feel louder. Those choices have different jobs, and removing both without listening could change the record you just approved.

Explain which processing defines the sound. Ask whether the engineer wants an alternative without the final limiter, the approved version or both. Clear labels make this a manageable choice.

In its preparation guidance, iZotope discusses leaving working room and considering an export without limiting where appropriate. A universal peak number is a poor substitute for that conversation. Turning down an already distorted or heavily limited file cannot restore the dynamics removed earlier in the chain.

Listen to the file you are sending

Use the agreed source format. Converting a lossy review copy into a WAV does not turn it back into the original recording, and increasing resolution simply to produce a more impressive number is not the goal.

Apple’s Digital Masters guidance emphasizes high-quality source masters. For your own delivery, the useful habit is keeping the best original material and following the engineer’s actual specification.

Then open the export outside the DAW and listen all the way through. Check the first attack, ending, fade, channel balance and correct edit. This is the moment to discover that an old guide vocal slipped back in. Keep a copy of this approved export so later comparisons have a dependable starting point.

• Correct song, mix revision and requested alternate.
• Agreed format, sample rate and bit depth.
• No accidental count-in, missing entrance or chopped decay.
• Processing choices explained in the delivery note.
• Full-song listening check completed.

Tell the engineer what you love

A reference becomes more useful when you explain why you chose it. Perhaps you love how a vocal stays intimate while the chorus expands. Perhaps the drums feel forceful without flattening the rest of the song.

Those are musical clues. Asking for another record’s entire sound is much harder to interpret, especially when its arrangement and performance are completely different from yours. A few specific observations give the engineer something to listen for.

If the mastering source has less bus processing than the mix the artist approved, include that listening mix as a clearly labeled reference. Explain the difference. It helps the engineer understand the sound everybody has been living with without confusing the reference with the file they should actually master.

Give the master a proper listen

When the master arrives, compare it with the mix at reasonably similar listening levels. Then enjoy it at a normal level on familiar systems. Is the feeling you cared about still there? Do any details now distract you?

For a longer release, listen across the track boundaries as well. An individual song can sound good while its entrance after the previous track feels wrong. The sequence deserves its own attention.

Collect the team’s feedback into one clear response, naming the master revision and locating each issue. Once approved, record which files go to which destination. Your mastering source, final master and alternate versions can all stay in the archive, but nobody uploading the release should have to guess which one the artist chose.