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How To Fix A Drifting Beatgrid In Serato (Live Records And Old Songs)

Why Serato's beatgrid slides off the beat on live and older records, how to fix it with a flexible grid, and how to quantize the track itself so it plays on one steady BPM.

You load an old record, Serato grids it, and the first few bars look perfect. By the second chorus the kicks are sitting just after the lines. By the outro they’re half a beat out, sync has given up, and you’re riding the pitch fader to keep the mix together.

Nothing’s wrong with Serato. The record is drifting.

Why the grid slides

A beatgrid is a promise that the track plays at one tempo from the first bar to the last. Anything made to a click track keeps that promise. A lot of records don’t:

  • Live bands. Drummers push into a chorus and settle in a verse. Over five minutes a record can wander from 113 to 118 BPM and back.
  • Old records. Most soul, Motown, funk, disco and 80s pop was played, not programmed. The tempo breathes.
  • Live recordings and some re-edits, where sections from different takes were joined.

Serato reads the average tempo, lays one grid across the track, and the further the record strays from that average the further the beats slide off the lines.

Fix 1: a flexible grid

Recent versions of Serato DJ Pro let a grid bend: a flexible beatgrid.

  1. Load the track and open the beatgrid editor.
  2. Unlock the grid if it’s locked (the padlock).
  3. Move to where the kicks start sliding off the lines, and add a marker there, putting it on the kick.
  4. Carry on through the record, adding a marker each time it drifts.

It works, and the grid will be right. But it’s slow (a drifting record can need a dozen or more markers), and it only fixes the grid. The record still speeds up and slows down, so against a steady track you’re still adjusting through the mix.

Fix 2: quantize the track

The other way is to take the drift out of the audio. A quantized copy has every beat moved onto a steady grid, with the key kept, so the record plays at one BPM from start to end. A single fixed grid fits it, sync holds, and it beatmatches like a studio track.

In a DAW that’s warp markers on every beat, by hand. IntroEdits’ Quantized edit does it in one step:

  1. Open the editor and choose Quantized edit, or in the Mac app press Edit on any track and pick it.
  2. Drop the track in. It finds every beat, works out the steady BPM the record averages, and moves each beat onto it.
  3. Check it by ear: a metronome plays on the kick from start to end, and Original plays the record drifting off the same click.
  4. Keep the BPM it suggests or type another, then save.

The copy comes back with its Serato beatgrid already set and locked, so it opens gridded. Your original isn’t touched.

Which should you use?

  • A flexible grid if you want to keep the record exactly as it was, drift and all, and only need beat jumps and loops to land.
  • Quantizing if you want to mix the record: sync it, blend it long with a modern track, loop it, or make an intro edit of it.

One thing quantizing isn’t for: tracks that change tempo on purpose. A transition edit that goes from 105 to 112 BPM, or a record built to speed up, would be locked to one tempo the whole way through. For those, a flexible grid is the right tool.

Try it

A quantized edit counts as one of your three free edits a month, and saving the same record again that month is free. Quantize a track in your browser, or get the Mac app to do it straight from your Serato crates. Making intros for the same records? See intro edits from your Serato crates.

Common questions

Why does my Serato beatgrid drift?
Because the record does. A beatgrid assumes one tempo from start to end. Records made before click tracks were common, and anything played by a live band, speed up and slow down by a few BPM, so a grid that's right at the start is off by the middle.
How do I fix a drifting beatgrid in Serato?
Either give it a flexible grid - unlock the grid, Edit Grid, and add markers wherever the beat moves - or quantize the track, so the record itself plays at one steady BPM and a single grid fits it.
What's the difference between a flexible grid and quantizing?
A flexible grid follows the drift, so the grid is right but the record still speeds up and slows down against whatever you mix it with. Quantizing removes the drift from the audio, so the record holds one BPM and beatmatches like a studio track.
Can Serato quantize a track for me?
No. Serato can grid a track, flexibly in recent versions of Serato DJ Pro, but it doesn't change the audio. To get a copy on a steady BPM you need an editor - in a DAW by hand, or with a tool like IntroEdits' Quantized edit.
Will quantizing change the key?
No. Each beat is moved onto the grid and the pitch is kept, so the copy sounds like the record, in time.