how to check sound quality is good of my mp3s at 320kbp for club systems.

hi done anyone know how to link 2 sets of controllers up use control 4 decks, Im using the pioneer flx-6 which has a 4 way mixer. i know i can press a button to change deck but i want use all 4 all at the same time. I need to map the jog wheels off a another controller to work but cannot find the jog wheel in the midi map settings

hi thanks for letting me join.