This mapping is made for four decks. the idj3 now has another looping system and the reverse play is now a modifier that alows you to press it and change the bass, midd and treble into gain, filter and pan. the bass and mid kills now has dj shiftees "plooping" effect (ass seen here http://www.youtube.com/watch?v=Iy96Al2iEcQ ) and the midi fighter has the Instant Gratification Mapping for deck a and b on the two buttons up to the left and on the two top buttons to the right there is a hot cue system