What Files Does Mastering Need for Release?

The master starts with the right mix file.

What files does mastering need? Start with the finished version of the song, at the highest useful quality you have. Not a preview export. Not a session folder. Not a file sent through a chat app that has reduced it on the way.

Your mix is the decision. Mastering is where I hear that decision as a whole, then shape it through one analog chain for the places your record will live. The goal isn't to change your mix, it's to make it the same, only better.

A clear delivery saves time at the start and keeps the conversation on the music. Here is what to send, what to leave alone, and when a different kind of file makes sense.

What files does mastering need for a stereo master?

For most releases, I need one stereo WAV or AIFF file per song. Export it from the final mix session at 24 bit or 32 bit float. Keep the original sample rate. If your session is 48 kHz, send 48 kHz. If it is 44.1 kHz, send 44.1 kHz.

There is no benefit in converting a 44.1 kHz mix to 96 kHz before sending it. That only creates a larger file. I would rather receive the file at the rate it was actually made.

Send the full song from its true beginning to its true ending. Let reverbs, delays, and the last note decay naturally. Avoid a cutoff tail because the bounce ends exactly on the last bar. If the song has intentional silence at the top, leave it there and mention it in your notes.

MP3s are useful for sharing a reference, not for the master itself. Their data reduction can blur transients, alter high frequencies, and make it harder to judge the small moves that matter. The same goes for files downloaded from a streaming platform.

Keep your mix bus choices when they are part of the record

Do not remove your mix bus processing automatically. If the limiter, compressor, saturation, or tonal shaping is part of how you hear the record, print it that way. Your finished mix should sound finished to you.

What matters is knowing what is intentional. If a limiter is only there to make a loud work print, send a second version without it as well. Label both clearly. I can compare them and tell you which gives the record the right starting point.

Do not chase a fixed headroom number just because you saw it in a forum. A mix that peaks at minus 6 dBFS is not automatically better than one peaking closer to zero. Leave enough room to avoid accidental clipping, but preserve the balance, impact, and color you built.

If clipping is an artistic choice, say so. A hard kick or a rough vocal texture may be central to a hip hop or rock record. Context changes the answer.

Name files so nothing gets guessed

A good file name answers basic questions before playback begins. Include the artist name, song title, version, and sample rate if it helps your release team stay organized.

For example: `ArtistName_SongTitle_FinalMix_24bit48k.wav`

Avoid names like `final_FINAL_2_reallyfinal.wav`. They make it easy to master the wrong version when several people are sending updates. If there is a clean version, instrumental, radio edit, or alternate mix, make the distinction obvious in the filename.

Send a note with the running order if this is an EP or album. Song order affects pacing. The space between tracks matters too. A hard cut, a two second breath, and a continuous transition all ask for different handling.

Your note can be simple. Tell me the artist and release title, the intended release date, the main formats, and anything you want me to hear. You can mention a moment where the low end feels right, a vocal you want kept forward, or a transition that should stay untouched. This is not a list of instructions for every frequency. It is the musical context around the mix.

When stem mastering is the better file delivery

Stereo mastering works when the balance inside the mix is locked. Stem mastering is useful when a few grouped elements need room to move before the final master is set.

For example, you may have separate stems for drums, bass, music, lead vocal, and background vocals. On an electronic record, the groups might be kick, drums, bass, synths, effects, and vocals. The right groups depend on the arrangement, not on a fixed template.

Stem mastering is not a substitute for a mix that still needs broad repair. If the snare needs a different reverb, the vocal has uneven edits, or the guitar is fighting the vocal in every chorus, return to the mix. A stem session is most useful when the record is already close and a small relationship between groups is holding it back.

Every stem must begin at exactly the same point and run to exactly the same end point, including silence. This lets all stems line up perfectly when played together. Print any sound that belongs to the arrangement, including effects that are meant to be heard.

Before sending stems, play them together against your stereo mix. They should reconstruct it exactly. If they do not, something is missing, doubled, or routed differently. Catching that before delivery keeps the session focused.

Vinyl and Dolby Atmos need their own context

Vinyl starts with the same finished mix, but the sequence and running time become part of the file delivery. Send the proposed track order, the side breaks, and the timing for each side. A long, loud side has different limits than a short, open one. Deep bass, extreme stereo movement in the low end, and very bright material can also affect cutting choices.

Do not make a separate vinyl mix by default. Send it only if you already have an intentional alternate version. Otherwise, send the mix you want people to hear and include the vinyl plan. We can make the right decisions from there.

For Dolby Atmos mastering, send the ADM BWF export from the completed Atmos mix, along with a stereo reference. The reference makes it clear which version and arrangement belong together. Include any notes about the intended format, song order, and transitions.

An Atmos file is not the same as a stereo master placed in a larger container. Its objects, beds, movement, and balance are part of the mix. Deliver the approved Atmos version, not an early export made before the final listening pass.

References help, but they do not replace your mix

You can send one or two reference tracks if they explain an intention. Maybe you like the dry vocal placement on a jazz record, the weight of an EDM kick, or the open top end of an indie release. Say what you are listening to, rather than asking for a copy of another record.

References are less useful when they become a target loudness number with no musical reason behind it. Streaming services change playback levels. Vinyl has its own physical realities. A master needs to keep the character of your song across those places, not imitate a meter reading.

If you have heard the mix in several places, tell me what changed. Maybe the bass disappears in the car. Maybe the vocal feels sharp on earbuds but right on monitors. Those observations are practical. They help point us toward the part of the record worth checking closely.

Send the version you can stand behind

Before upload, listen once from the top without touching the session. Check the song start, ending, fades, edits, and any pops or clicks. Confirm that the exported file is the mix you approved, not an earlier version with a familiar name.

Then send the file and the notes. I return a first master within three business days. Two revisions are included from the same mix. If you send a new mix after mastering has begun, that is a new master because the listening and analog moves begin again.

The best delivery is not complicated. It is a finished mix, a clearly named high resolution file, and enough context to understand where the record is going. That leaves the listening where it belongs: on the song.

Tell me about your record. One fixed price within one business day.

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