MASTER LABBlind mastering
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Blind test · 20 seconds

Which one is mastered?

Two clips of the same Suno track at equal loudness. One is the original, the other went through Master Lab. Listen and pick.

Version 1
Version 2

Play both and press “This is the master”. No sign-up.

How it works

Three steps to release

  1. 1Upload your trackWAV or MP3 straight from Suno. The agent listens and makes two masters.
  2. 2Pick by earA and B play at equal loudness and you don’t see the style names. You choose what your ear likes.
  3. 3Adjust and downloadButtons in plain words: “Vocal is buried”, “Boomy bass”. Each press is re-rendered in seconds.
What the agent does

Why Suno tracks sound quiet

Suno exports tracks quieter and softer than releases on streaming services, so next to other songs they lose before the first chorus. The agent does what a mastering engineer would, in five steps.

  1. 1Tone from a referenceMatches the frequency balance and stereo width to a reference release. The low end is raised carefully so it doesn’t boom.
  2. 2Clean lowsRemoves sub-bass rumble you can’t hear but that eats loudness.
  3. 3GlueGentle 2:1 compression pulls instruments and vocal together.
  4. 4WarmthLight tape saturation adds density without mud.
  5. 5LoudnessA limiter brings the track up to release level and keeps the peak at −1 dBTP or below.
A Suno test track before and after
Loudness−16.1 LUFS−9.4 LUFS
Peak−3.7 dBTP−1.1 dBTP
Measurements of one track, not a promise for every track: the agent works to yours.
No decibels, no frequencies

Say what’s wrong, the agent gets it

Typical Suno problems fixed with a button, plus versions for where people will listen: streaming, phone and TikTok, car.

Quieter than othersThe track gets as loud as releases on streaming services.
Hurts the earsSibilance and cymbals are tamed only at the moment they spike.
Boomy bassRemoves rumble and boxiness, the low end gets tighter.
Not enough bassDeeper lows you can hear even on a phone.
Vocal is buriedThe voice comes forward, the words get clearer.
Sounds flatLess squashing, so the hits punch again.
FriendsBlind vote from friendsSend a link: friends play “Version 1” and “Version 2” without signing up and vote. You see the votes and comments.
ReleaseRelease-readyLoudness and true peak checked for Spotify, YouTube and Apple Music, so the platform won’t damage the sound when encoding.
TikTokClip for TikTokThe agent finds the strongest part of the track and gives you 15 or 30 seconds with a soft fade in and out.
Honest comparison

How we differ

UsuallyIn Master Lab
The master plays louder than the original, and louder seems betterVersions play at equal loudness, so you hear the difference in sound
One resultTwo versions, blind, style names hidden
Knobs in decibelsButtons in words: “Vocal is buried”, “Boomy bass”
Getting a second opinion means sending files aroundA blind vote from friends via a link
The result is gone once you close the tabAll tracks and versions stay in your studio
Pricing

Start for free

Prices are in Ukrainian hryvnia for now. No subscription needed: buy one track with WAV that never expires.

Free0 ₴
  • 2 tracks a month
  • MP3 downloads
  • Up to 12 adjustments per track
Try it
Single track79 ₴
  • No subscription
  • WAV for streaming
  • Never expires
Buy
Start199 ₴ / mo
  • 10 tracks a month
  • WAV for streaming and USB
  • Unlimited adjustments
Choose
Studio449 ₴ / mo
  • 50 tracks a month
  • Priority in the queue
  • WAV and unlimited adjustments
Choose
FAQ

Common questions

How is this different from the “master” button in other services?

Most services give you one result and a before/after where the master simply plays louder. We make two versions at equal loudness and hide which is which: you choose by ear, not by volume. Then you adjust in plain words instead of decibel knobs.

Why does my Suno track sound quieter than released songs?

Suno usually exports tracks quieter and softer than commercial releases. Mastering brings the loudness up to streaming level and keeps the peak in a safe range so platforms don’t distort it.

MP3 or WAV?

MP3 is fine for listening and social media. For a distributor and streaming services take WAV: it is lossless. WAV comes with a paid plan or a single-track purchase.

Can I release the track on Spotify?

We prepare the sound: loudness and peak that meet platform requirements. Each distributor has its own rules for AI-generated music, so check them before you release.

What does the free plan include?

2 tracks a month, both versions, up to 12 adjustments per track and MP3 downloads. No card needed.

What files can I upload and what do I get?

WAV, MP3, FLAC, M4A, AIFF or OGG up to 150 MB, several at once. You download MP3 at 192 kbps, and with a paid plan or a single-track purchase also WAV at 24-bit / 48 kHz.

How long does it take?

The agent starts both versions as soon as you upload; a 2–3 minute track usually takes a minute or two.

What does the agent do to my track?

It matches tone and stereo width to a reference release, removes sub-bass rumble, glues the mix with gentle compression, adds a touch of tape warmth and raises loudness to release level while keeping the peak at −1 dBTP or below. The two versions differ in character: one brighter, one softer at the top.

What if I don’t like either version?

Adjust in words: “Vocal is buried”, “Boomy bass”, “Sounds flat” and so on. Each press adds a new version next to the others; earlier ones stay and the original is never changed.

Can I use my own reference track?

Not yet. The agent matches the sound to a reference release we picked by ear, and you change the character with the buttons.

What happens to my files and rights?

Only you see your tracks; friends hear just the two versions behind your link. We don’t share files with anyone or train any models on them. The rights to your music stay with you. Versions you didn’t pick are deleted after 7 days.

Does mastering remove the Suno watermark or AI label?

No. Mastering changes the sound, not where the track came from, and it doesn’t change Suno’s terms. Whether you can sell or release the track depends on your Suno plan and your distributor’s rules.

Are you affiliated with Suno?

No, Master Lab is an independent service. Suno is a trademark of Suno, Inc.

Is the app in English?

This site is. The studio where you upload and compare tracks is in Ukrainian for now; the English version is on its way. Prices are in Ukrainian hryvnia.

Hear your track two ways

2 tracks a month free, no card.

Try it free