Reply to deck c & d controller

so i have the S2 and a midi fighter because I enjoy to do different effects during each song and at the moment really will have 1 song at a time with the other deck to transition and stuff. i want to branch out and use four decks though and use decks C & D to play a minimal house loop in the background behind my electro/house tracks to mess around with further with beats and such i was wondering what controller would best suit me to do this? a launchpad? an x1? and a mapping would be helpful too haha