I have used the Rogue with iPad, works great. Have not yet tried SoftStep and QuNeo, I would think you would have to have a powered USB hub, then feed into camera connection kit.
KMI Sr. Product Specialist - Pacific NW
KMI QuNexus, KMI QuNeo, KMI SS2 w MIDI Exp, KMI 12 Step, Live 8, PT 9, Studio One, Axiom 61, lotsa plugs, Line 6 Echo Pro, Macbook Pro, Presonus mixer