The blue LEDs around the jog dial sometimes flash or flicker. (The white LEDs around the jog dial flash or flicker on DDJ-ERGO Limited.)

The blue (white) LEDs on DDJ-ERGO indicates whether the beats of the two decks are synced or not. When the beats of the two decks are synced, the blue (white) illumination is lit brightly and when they become off sync, the illumination is lit dimmer while the Mix Pulse Mode is active.

Please see [Mixing] of [Basic Operation] in the Operating Instructions for details of how to adjust the playing speed.