I'm curious. What other iOS apps have the capability to turn a pdf score into an editable version of the same score?
I use an application called SmartScore on Mac to do this very thing. And it does it very well, enabling you to edit, play, print and export your score in various formats, including Music XML which can then be imported into any notation software, if desired.
It's an extremely complex process, and even SmartScore does it with only 99% accuracy, so there's always some editing to do after the conversion from pdf.
There are other applications that do this, but after considerable research, I believe SmartScore 64 does the best job.
I'm not aware of any apps that do this on iPad. Any scoring software can play a file in its own format as midi. That's what Notion does. I don't know of any software that can do that from a pdf. Please correct me if I'm wrong about this.