hi,
actually..
if you are using 4 decks.. it's 4 outputs and use the djm2000 as your soundcard: 4 line (8ch). line 1 (ch1/2) for deck a. line 2 (ch3/4) for deck c. line 3 (ch5/6) for deck b. and lastly line 4 (ch7/8) for deck d.
if you are using 2 decks and 2 cdj's .. it's still 4 outputs and use the djm as your soundcard: 4 line (8ch). line 1 (ch1/2) for cdj#1. line 2 (ch3/4) for deck a. line 3 (ch5/6) for deck b. and lastly line 4 (ch7/8) for cdj#2.
:)