Pioneer DJ - DJM-850 - Layout  

Input Selects

21. INPUT SELECT. Set this selector to the appropriate position to define which Channel Input will be routed to the 4 Mixer Channel Outputs
    
    Set to USB position to route a VirtualDJ deck output to a mixer channel.
    
    On PHONO/CD/LINE position the audio signal from the Inputs (1, 2, 3 and 4 at the rear panel) will be routed directly to the Output of this Mixer Channel. In this case the sound from the computer’s decks will be muted. Use this position to route external analogue media sources.
    
    By default VirtualDJ decks 1, 2, 3 and 4 will be routed to mixer channels 2, 3, 1 and 4 (middle channels will control the main left and right decks). Order can be changed to your needs. See Mixer Order.
    

Master