If your question relates to notation of the melody:
there is no facility inside iReal Pro to add melody (notation) currently.

You should be able to easily use the android app, Mobilesheets which will import (PDF, JPEG, photos from your device's camera, etc.) your notation files. iReal Pro will play in the background. Any recent tablet should have enough processing power to do this. If you have a small phone screen, reading notation will be difficult unless you are projecting to a larger display; a 10 or 13 inch tablet seem to be popular for notation.
Mobilesheets can attach an audio track to the song sheet (iReal Pro can create an audio file from its songs.)
http://www.zubersoft.com/mobilesheets/


Run a search for Mobilesheets here at the forum for any other comments. Also iPad users use forscore app (and others) in a variety of ways, so although it is iOS-related, searching for threads about this app might give you background information.
Here is one:
http://www.irealb.com/forums/showthr...g-using-Player