Hercules DJCONTROL INPULSE T7 Mode D'emploi page 36

BEATMATCH GUIDE: enables or disables the light
guides to adjust the tempo and align the beat grids of the
two tracks. There are four red arrows per deck.
DJUCED ®
synchronization (Master Sync) deck, and the other as
the slave deck. The red arrows only light up on the
slave deck, as this deck follows the tempo of the master
synchronization deck.
Serato DJ
synchronization deck. The red arrows light up on both
decks.
defines one of the decks as the master
Lite does not define
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a master