When adjusting the tempo of a deck that is currently in SYNC, this will adjust the tempo of all tracks currently in SYNC and will alter the tempo for all synced track.

This is known as relative pitch. However, when using vinyl or CDJs in Relative mode with Simple Sync activated, adjusting the pitch on your hardware will only affect the deck you adjust.

Disengaging sync on a deck causes the pitch to return to its absolute pitch level as represented on the hardware slider.