So Mark, in short, it might not be correct to say that changing the extensions from .mid to .smf means that it will work. Or will it work? Or do you also want to say that there is no mention of smf in the manual? Did not quite understand. Because from what I remember in the keyboard menu, when I was with it, it made reference on the pen drive to the need for .smf files as I remember.
I await the answer,
Miguel.