I know Harry Connick's big band charts are all digitized and controlled from one computer. (Of course, they use large monitors, not their smart phones *haha*) This sounds like something that would require a whole different program to accomplish, not just iRealb. The big bands I've worked with pull out all the individual charts (paper ones) before each set so there isn't any fumbling time between songs. Your guys could do the same thing with iRealb by creating a Playlist and moving the files into it, in the order they'll be called. Then they can just "turn the page" and the next chart will be there. At the end of the set they can just delete the Playlist. (Man, that is SO much easier than having to put all those damn books back in order!)