First niggle…

Because of the small screen real estate, different edit and play screens are only available in either portrait or landscape orientation, which means turning the phone around a fair bit while doing setup. Not that easy with a big dongle sticking out the bottom with usb, audio mini jack and Lightning power all connected!

Not an issue if you set it all up in advance before you perform, but a bit of a faff while you are messing around!

And yes, you can get MIDI in and audio out all while simultaneously charging. I bought one of these… https://www.amazon.com/USB-Camera-Adapter-Headphone-Compatible/dp/B07P94PB7Z

More to come…