The IPad Pro is almost page size. I had regular size, although too small.
Speed is important to me when selecting a PDF.
Igig book is good app to read PDF downloaded purchased fake Books. Music Reader too is a good app. I tried them all but Songbook+, Baum Software is my favorite. It can play midi and MP3 too. All I Use it is for sheet music, lyric read and interface with the Korg PA3x Songbook. I have a Yamaha bt-01 which is a midi to Bluetooth transmitter from my Korg(plugs in the host port). Wireless to ipad, No need for the iPad camera kit connection. Works perfect.
I can go anywhere in the room with my iPad, select the song from the songbook iPad playlist, as soon as I hit a left hand chord on my accordion and it will start the style selections on my keyboard remotely. How to end the song, another problem, which can be done with a Bluetooth transmitter taped to my accordion , hit the button, song ends. This requires more hardware though.
I think they have Bluetooth pedals that you can program to do functions on the keyboard? End, start stop, variation, harmony, etc. that will be my next project.
That is why I was asking before if BK7m is capable as in my application. :ch