Hi Matteo,

You find more info about the MF here : http://psrtutorial.com/L/MF/03_Files.html
You can download Michael Bedesem's Music Finder View program here : http://psrtutorial.com/Files/OFmusicfinder.html
I loaded a 3000 file into the MF program and took out some song, saved it as 3000 (since the 1500) isn't in it, but it loaded fine in my 1500.

About the voices, carefully read the blue italics text on this page : http://psrtutorial.com/L/QS/43savingeditedvoices.html

Hope this helps,
John

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Have a nice day