Welcome.
My experience of using Arturia midi controllers on an iPad is the basic midi functions work, ie the keys (obviously), pitch bend, modulation, drumpads, but the other buttons it's a bit of a lottery. I haven't specifically tried it with Auria Pro.
You probably already know unless you connect it to a computer you can't make use of the bundled software (Analog Lab, Ableton Lite, Piano V), but I'd thought I'd mention it just in case it wasn't obvious. The bundled software partly accounts for the KeyLab's price.
