Since fake books print a melody line and chords only, that would be a really neat trick to write a script that would convert any given piece to the format. Way too broad, I think. If all your scores follow a standard format, it wouldn’t be hard to extract what you need but any piece? How would you define the elements you need for that?

Converting piano/chord lead sheets to fake book format would be a pretty easy since all you’re doing is losing the piano part. I’ve never considered writing a script for it, however. I don’t do it enough, I suppose.

Dear Mike,

thank you for your reply and, yes of course you are right. I was being way too unclear. I of course meant any given piece in that lead sheet style, not all sorts of orchestrations. But since I have never really used finale script or gotten far with it I don´t even know the basics of the commands it takes to convert a simple leadsheet into a jazz layout (chords, suffixes, lyrics etc.). I can do it manually of course in 5 to 6 steps converting each of the afforementioned elements..

In other words, you wish to take a Finale file (perhaps in Engraver style) and run a script that would change the fonts, including chords, into Jazz fonts?

Exactly, a Finale file or musicXML file, which I import.

… musicXML file, which I import …

I suspect that you can save time by importing the MusicXML file into a Jazz font Default Document.

Thanks for clearing that up. 

Peter's suggestion appears to be the most practical, especially if the .xml files all come from the same source or you are scanning them in.