BPM SYNC: Track A bpm is equal to Track B speed/tempo/bpm only. The DJ still has to manually line up the beats
BEAT SYNC: Track A bpm is equal to Track B speed/tempo/bpm and the nearest beats line up.
BAR SYNC: Track A bpm is equal to Track B speed/tempo/bpm, the start of the bar lines up
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Beats and Bars explained
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There are a few things that will ensure that two tracks sync
Tracks have the correct BPM/Tempo
The grids are on beats - Sometimes the tempo is correct but the grids are not on beat. This is easily corrected on the fly by sliding the grid left or right.
The DJ understands beats, bars and phrasing.
Steps
Load deck A, Press Play
Load deck B, press SYNC
Mix deck B in
Load new track to deck A, Press Sync, Press Play
Rinse and repeat for Deck B
Back and forth
Since 2.0, you only need to press SYNC on the incoming player/track