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I can see that...
BEAT SYNC: When BEAT SYNC is turned on, the BPM and beat position of the track playing on the deck is automatically synchronized with those on the deck set as the MASTER.
BPM SYNC: When BPM SYNC is turned on, the BPM of the track being played on that deck is automatically synchronized with those on the deck set as the MASTER.
Think of it this way... it's quantize for you to start playback without having quantize enabled for the other functions.