Help & user guide

What it does. A mixer or recorder pushed into the red replaces the loudest peaks with a flat line. This switch finds those flat-topped runs, rebuilds each peak from the audio either side of it, then holds the rebuilt peaks below clipping in the master. The flat top is what makes a clipped recording sound harsh, so rebuilding it is what removes the harshness.

When to use it. Your recording shows red on the meters, or sounds buzzy and crushed on the loud parts. Leave it off for a clean recording: it will find nothing and the master is unchanged.

What to expect. It is a repair, not a recovery. A lightly clipped set comes back clean; a heavily clipped one comes back better. Stretches clipped for longer than 20 ms are left exactly as they are, because there is nothing either side to rebuild from, so a recording clipped for seconds at a time is not rescued. The result card reports what it did, for example “Repaired 312 clipped regions”.

What it does. Removes mains hum (50 or 60 Hz and its harmonics) when the hum is clearly there, and repairs surface clicks by rebuilding the audio either side of each one. A hum too faint to act on is left alone.

When to use it. For a set recorded from turntables. Leave it off for digital mixes. After an upload that measured like a turntable recording, the form will suggest it next time; nothing is switched on for you.

Click sensitivity. Normal is the default and is right for most records. Studio Lite and Studio can choose High, which finds smaller clicks and repairs more of them. Start with Normal.

What to expect. Works on clicks shorter than 3 ms. Deep scratches and skips are left as they are, and it does not remove hiss or crackle. The result card reports what it found and fixed, for example “Vinyl cleanup: removed 50 Hz hum (-24 dB), repaired 312 clicks”. If it finds nothing, the master is identical to having it off.

What it does. Click Add more mixes under the drop zone, or drop several files at once. Set the profile, output format, destinations, DJ name, artwork and cleanup switches once; give each mix its own title, description and genre in the list; click once.

How it runs. Uploads go one after another. Mastering runs on our servers two at a time, so the rest wait their turn. Once the uploads have finished you can close the page: one “your master is ready” email arrives per mix, and each mix appears in your History as its own row.

Limits. Studio Lite takes up to 5 mixes at a time; Studio takes up to your remaining monthly allowance. Each mix counts against your monthly allowance exactly as a single upload does.

Why recordings split. Recorders and DJ software write WAV files with a 2 GB or 4 GB limit, so a long set comes off the card as two or three files: about 3 hours 20 minutes each from Traktor, and 3 to 6 hours from Zoom, Tascam, Denon Engine and Howler recorders, depending on the bit depth.

How to join them. Pick all the parts at once (or drop them together), then choose Join into one recording. The parts are listed in filename order; use the arrows if anything is out of place. If the files' saved times suggest they were recorded in a different order to their names, the page says so. Give the recording one title and genre. The parts are joined end to end, sample to sample, with no gap and no crossfade, and mastered as one mix. One email arrives when it is ready.

Silence at the ends. As on every master, silence before the music starts and after it stops is trimmed automatically, so the dead air at the start of the first part and the end of the last one is removed. Nothing inside the recording is cut.

Limits. Up to 6 parts. A join counts as one mix. Your plan's length limit applies to the joined recording.

Strips the sub-audible rumble and offset that turntables, hi-fi line-ins and older recorders leave behind, before mastering starts. Both eat headroom without adding anything you can hear. On a clean digital mix it changes nothing.

Yes, when you publish to SoundCloud or Mixcloud. Under the publishing steps, choose Import from DJ softwareand pick your history export: from rekordbox, right-click the set in History and export it to a file (.txt); from Serato, export the session from History (.csv); from Traktor, choose the set's .nml file in the Traktor History folder. Anything else, paste the list, one track per line.

Check the tracks, untick any you only cued in your headphones, and choose whether to include the record label and start times. Mixcloud shows the tracklist on the show; SoundCloud gets it at the end of the description. The file is read on your computer and never uploaded.