How to control Headphone mix on DDJ-RB:
1. When the CUE button is turned to max:
Turn on the HEADPHONES CUE 1 or 2 button on DDJ-RB where you want to use.
Turn off the HEADPHONES CUE MASTER button on DDJ-RB.
2. When the CUE MASTER is set at the center position:
Turn on the HEADPHONES CUE 1 or 2 button on DDJ-RB where you want to use.
Turn on the HEADPHONES CUE MASTER button on DDJ-RB.
3. When the MASTER is turned to the max:
Turn off the HEADPHONES CUE 1 or 2 button on DDJ-RB where you want to use.
Turn on the HEADPHONES CUE MASTER button on DDJ-RB.