Been gone for a while, good to be back. Looking to pick up a good control surface app for my iPad mini. Several in the App Store but not sure what's working well so I wanted to ask here. I'm using logic X. Thanks in advance

I might add I already have the free app that came with logic and it works really nice, just thought I would see what anyone else liked. Hardware controllers are great but iPads are really becoming a bigger part of DAW controllers.