Tony, it's going to be important to scale any pdf's up to the edge of the display. If your music scan has got a decent sized border, that's going to reduce the size of the notation significantly. But yes, you are right... for traditional notation, it is still a bit small. But leadsheets and fakebooks don't need to cram so much into one page.

Your other option is to put it up in landscape mode, and then have the iPad display a half page at a time, and use the footswitch to scroll/jump down the half page. If UnReal Book can't do that yet, I am sure it's a pretty easy option to enable. That would certainly blow the chart up to actual size...