Pioneer Dj OPUS-QUAD 4-Channel All-in-One DJ System (Black) - Manual (Page 89)

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Key Sync
You can adjust the key of a track playing on the unit to match with the key of a track loaded on
the sync master.
• You can’t adjust the key for tracks that haven’t been analyzed by rekordbox.
Using Key Sync
1 Press the [KEY SYNC] button when a track is loaded.
The key is adjusted to the key with the least change among the following.
— Same key
— Dominant key
— Subdominant key
— Relative key
— Relative key of dominant key
— Relative key of subdominant key
• Press the [ KEY SYNC ] or [ MASTER TEMPO ] button to reset to the original key.