Considering very much to purchase the JV3 but can anyone confirm about the compatability for transporting my own music library to use the jam along feature.?. In particular about the itunes library or licenses for songs that I want to learn and jam along to my song library. I do not have itunes but I transferred my vinyls to mp3 format and including my own cds. Can I still use my music without these prerequistes? Please, if anyone could give me some info about the new and old. Thanks in advance!!