Linda,

If you use easy record on the MZ, your only option to save the song from memory is to use "casio Format". This does mean that to play the song back again, it must be reloaded into memory (unlike direct play which reads straight of the disk in MIDI format 0). If you have a midi connection on your computer, it is possible to play the song into a computer program such as cakewalk, and then save this as a standard midi file. You will however, have to add program changes etc, to the melody voice, as these are not sent with the song data.
Hope this helps
Robin