Mastering Do's and Don'ts: The 60-Second Checklist
You bounced the track. You're about to upload it for mastering. Stop for sixty seconds.
Eight rules decide how good your master can get. Four things to do, four to stop doing. Most of them cost nothing but attention, and every one of them is a lesson somebody learned the expensive way.
The Do's
Do upload your cleanest mix. Not the "loud demo" bounce you sent the group chat. The clean one. Mastering amplifies what's there, and that includes the noise floor, the clicks, and the vocal take with the headphone bleed. Clean in, clean out.
Do keep your dynamics. The quiet verse is supposed to be quiet. The drop hits because something before it didn't. Leave that contrast in the mix and let the mastering stage decide how much of it to trade for loudness. Squash it yourself first and there's nothing left to trade.
Do control the low end before export. Bass is where mixes go to die. High-pass what doesn't need lows, keep the kick and bass out of each other's pockets, and check the result on small speakers. A controlled low end is the difference between a master that sounds tight and one that just sounds thick.
Do bounce lossless at full resolution. WAV, AIFF, or FLAC. 44.1 kHz or higher, 24-bit or higher. Storage is cheap. The information an MP3 throws away is gone forever.
The Don'ts
Don't upload lossy files. An MP3 already went through one round of destructive compression. Mastering a lossy file is like photocopying a photocopy: every flaw gets sharper and nothing lost comes back.
Don't brick-wall the mix. If there's a limiter slammed on your master bus "to make it competitive," remove it before you export. Two limiting stages stacked up don't add loudness, they multiply distortion. Loudness is the mastering stage's job. Let it do its job.
Don't let the bass mask everything. If you have to turn the track up to hear the vocal over the 808, the master will have the same problem at every volume. Masking doesn't disappear at the mastering stage. It gets louder.
Don't leave clipping in the bounce. Red lights in the export are not "energy." They're distortion baked permanently into the file. Aim your peaks around -6 dBFS and nothing clips, ever.
The Screenshot Version
| Do | Don't |
|---|---|
| Upload your cleanest mix | Upload MP3s or other lossy files |
| Keep dynamics, leave room to breathe | Brick-wall or over-compress the mix bus |
| Control the low end before export | Let bass mask the rest of the track |
| Bounce lossless (WAV/AIFF/FLAC, 24-bit) | Leave clipping or distortion in the bounce |
Why These Eight?
Because they all protect the same thing: information.
Every rule above either preserves information in your mix (dynamics, headroom, lossless files) or stops a problem from being amplified (noise, masking, clipping). A mastering engine can shape what's there with real precision. What it can't do is un-crush, un-clip, or un-mask. Nobody can.
Want the long version, with the reasoning and the exact export settings? Read the full guide: How to prepare your mix for mastering. Curious what happens to your track after upload, and why no reference track is involved? That's covered here.
Then Put It To the Test
The checklist takes a minute. The master takes seconds. Upload your track to BeatSync Mastering, flip between original and master, and hear the difference yourself. AAC masters are free during launch. No credit card, no waiting room.
