I have been looking into Newzik, a sheet music reader app which combines PDFs and MusicXML files. I think iRealPro could be even more powerful if it had MusicXML support (or it may fall behind if some other auto-accompaniment/chart app comes out with MusicXML support).

Is iRealPro working on adding MusicXML support?

http://newzik.com
https://techinmusiced.wordpress.com/...-music-reader/