IKM has stupendous customer service. I reached out to them with our issues and was given a solution, of which I jumped right into. I sold my pre HD within a week of posting it the day I received the iRig Pro I/O. that one charges the iPad. It comes with a variety of options as far as connections go. What I didn't know is that you also have to purchase a dc power supply which takes up a lot of space in my Nanuk935. For you guitarists out there is even larger than the 1Spot for your pedals... by about twice that size. So keep that in mind. I didn't like that I had to buy a whole new rig, and it tucked learning afterwards that it didn't come with the anticipated pwr sply but what softened the blow was how cheap I got it from Reverb, as B stock and the fact that my Pre HD sold so quickly and for the requested amount.
My iPad Pro stays fully charged during continuous usage at mid to low brightness and never sleep. Oh, and I the RTA Audio app that I've been using for years is not compatible with the iRig Pro I/O as was confirmed after a few helpful back n forths with IKM
and their speedy customer service team. I've also let the RTA Audio dev team know of the issue via the apple store. Fingers crossed the they fix it cuz currently, it'll work just fine on batteries but it can't change and it won't pass Audio through to the monitor port.
Link below is for iRig Pro I/O
https://www.ikmultimedia.com/products/irigproio/