yes i read but no one of this program is open source so i don't undersand, for exalmple, how to update db, how i can backup the file or more function using, for example, C language or Java language. The information i would like to know it's how i can create another mp3 file manager and in what way the device do its function. I would like to create something like this: http://shuffle-db.sourceforge.net/ thanks Stuge for the attention