I know PDF import would be hard as you'd need to "OCR" the scanned image but you should be able to import Music XML. I'd buy another iPod just to run your software if this had an import function. As is, with no import this has very limited value (under statement so as to be polite)
Indeed!, I am a classical percussionist. Currently I have Gb's of music and method books scanned and OCR'd. With this app I would even buy a 2nd iPad (and of course 2 time the app if necessary!!!), as usually percussionists have large set-ups!. I will say that all professional players will get this app as many times we have to decide stick changes and setups displays just to turn pages in actual performances.