Hi - wow - transpose instantly?! My PDFs files are scans from books and sheets etc. so basically they are "photos". unrealBook (and other PDF viewers) can display them, let you add annotations (text and lines and such) on top of them, etc. - but I can't see how any app could transpose instantly if you have a PDF file - unless that PDF is some 'special' music file??

I'm assuming that in OnSong, you're using something other than PDF files perhaps, such as generating the songs (lyrics + chords) right in the OnSong app? Since I have ~1,200 songs now as PDFs, I'm not likely to want to re-enter them in a new app ... I've kind of "gone down the PDF path" and probably will stay with that.

FYI, with unrealBook, you can make some changes to PDFs - mostly along the lines of "annotating" by adding "on top of" the PDF files (lines, colors, circle something, underline, highlight, add text, etc.)

-Jin