Oh, DUH! I've got that book, Alison. I don't know if it's because you're a musical genius, or just very diligent, or both - but you always seem to come up with the answer. Thanks.
As for the MIDI files, I think the first two are the same, the third is different; and by the time I listened to the fourth, I couldn't tell any of them apart.
-Joe Offer-