What is a downbeat?
Count along to a dance track: one, two, three, four, one, two, three, four. Every "one" is a downbeat, the first beat of a bar. The first downbeat of a track is bar 1.
Why it matters
Tracks are built in phrases of 8, 16 or 32 bars, and phrases start on downbeats. Start the next record on its downbeat, at the top of a phrase in the record that's playing, and the changes in both land together: the drop meets the drop, the breakdown meets the breakdown. Start it a beat early or late and the two records argue, even when every kick is in time.
Why it's hard to hear
The tempo jumps out at you. Which beat is the "one" doesn't. Intros can start on any beat, some tracks open with a pickup before bar 1, and a long breakdown has no kick to count from. Even experienced DJs lose the count in a section with no drums.
How to find it by ear
- Listen for where the kick comes back after a breakdown. That's almost always a downbeat, and usually the top of a phrase.
- Listen for a crash cymbal, a new sound coming in, or a vocal line starting. Changes like these land on the one.
- A build or a snare roll leads into a downbeat. The hit right after it is the one.
- The bassline dropping out or coming back usually marks a downbeat too.
- Count back from what you're sure of. If you know where a phrase starts, the downbeats before it fall every four beats.
Why software misses it
Analysis finds beats well. It finds the one less reliably, for the same reasons you might: intros with no kick, pickups, tracks that start partway through a bar. When it guesses wrong, every bar line is off by one, two or three beats, even though each beat line sits right on a kick.
Downbeats in Mix//Sync
- Every track gets a bar 1 when it's analyzed.
- On a track from Rekordbox, the grid and the bar 1 you set there are kept.
- Four small dots on the mixer show which beat of the bar each deck is on.
- To move bar 1 yourself, pause the deck, open its grid tools with GRID, put the playhead on the kick that should be the one, and press Bar 1 here. The arrows slide the whole grid earlier or later in small steps, Undo takes back the last change, and your fix is kept for that track.
- Sync lines up beats, not bars, so which phrase you bring the next record in on stays your call.
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