Denon DJ - MC-4000 - Layout  

BROWSER

10. LOAD. Use these buttons to load the selected track from the Browser to the left or right deck. Hold the same button for more than 2 seconds to unload the same deck.
    Hold SHIFT down and then use these buttons to clone the deck to the opposite one.
    
    
11. LIBRARY. Use this encoder to scroll through Folders or Files. Hold SHIFT down and use this encoder to scroll faster (+/- 10 tracks per step). Push the encoder to set focus to the Songs List.
    
    
12. BACK Use this button to set focus to the Folders List. If the focus is on the Folders list, use this button to expand/collapse sub-folders.
    Hold SHIFT down and then use this button to cycle through the available center panels of the default GUI of VirtualDJ (Mixer, Video, Scratch an Master view)
    
    
13. LOAD/PREP. Press this button to add the selected track to the Automix List of Sideview.
    Hold SHIFT down to set focus to Sideview.
    If focus is on the Sideview hold SHIFT down and then use this button to cycle through the Sideview windows (Automix, Sidelist, Karaoke, Sampler and Shortcuts)
    Hold SHIFT down and press this button for more than 2 seconds to open/close the Sideview.
    

Sampler