I've been working with that same desk for a while now. The problem is not the mini vs the standard Ipad. Size (in this case) does not matter. Since you are seeing the router, the only thing I can think of, is that you are using the wrong app. QMix-AI is for Iphones and Ipods. Get rid of that app and download StudioLiveRemote-AI. That is what you need. Next, make sure the permission is set correctly. If you don't know how to do it, look at 3.5 step 5 in the manual. You can set it to control just your aux mix if you like, but giving it full permission, in case of another device failure, is always a good option. Let me know how you make out with it.