Reply to Please HELP! 2 MIDI FIGHTER+ S4

Alright i just received my 2nd midi fighter 2day And i cant figure out how 2 import 2 seperate mappings! People on the community said i can hook up 2 midi fighters up 2 my s4, 1 with the instant grat mapping and 1 controlling any deck with the deckalized mapping. ANY ONE KNOW WHAT THERE DOING PLEASE HELP!