Welcome to Jokosher! It would definitely be nice to be able to interoperate with other multitrack editors; when we were first designing Jokosher (at the time still JonoEdit) I remember we looked in to a proposed multimedia meta format, I can't remember the name though (I think Aq first mentioned it?). Although I seem to remember after glancing at the spec it seemed rather cumbersome and perhaps didn't support everything we planned to do.
Currently going nuts trying to find this. It was detailed on Wikipedia among other places, and I can't find the blaster thing... -- If cryptography is outlawed, only outlaws wifo4(F9%!98f3((hg$;'da"d;f+