Native Instruments - Kontrol Z2 - Layout  

Master

31. MASTER LEVEL: Controls the master output volume of the device. This control is hardware operated but its movement is visible in the VirtualDj GUI
    
    
32. BOOTHLEVEL: Controls the secondary (booth) output volume of the device. This control is hardware operated and its movement is not visible in the VirtualDj GUI
    

Mic - Aux