As you probably know, I've posted a number of "midi" performances" of my
own, from the WTC.  Many listeners don't know they're midi.  I'm not sure
what the implications of that are.  However, I entirely agree about the
educational value of midi.  With respect to Bach, it enables me to hear
relationships between voices that were not readily apparant to my ear.

John Grant
http://artists.mp3s.com/artists/42/john_lewis_grant.html