Hey all, I got a Numark Mixtrack pro 2 and an iPad 4 iOS 7.1.1, Yamaha i-UX USB W/30 pin to lightening adapter. I need a few things for my setup or alternatives. Can anyone suggest a good powered USB hub that can power my midi controller and iPad? I was using djay by algorithm, I continue to get a unsupported notification when I plug in my midi controller, is that a power issue or the connection method?