I use my XR18 as mixer and recording interface for small gigs, live... I use a MacBook Pro as recorder with Cubase and I also open the app to control the XR18. And it's all right. Now my iPad is broken and I start to use a Android tablet. And the android app is totally different from the Apple one. WHY??? Is not a good condition, in live, to think in different ways. It's not professional.