I've seen several emails since this summer regarding e-rolls and
MIDI files generated from scanning/reading player rolls.  I done
a little research (well, Google-fu) looking into it -- and reading
a few articles between e-rolls, MIDI, etc. -- and first off,
I can't tell how happy I am that some of these are being preserved.

But, one worry comes to mind that I did not find an answer to.
Specifically, although these rolls are saved, how do we get these
e-roll or MIDI files back into a paper roll?  I mean, can I contact
someone who's hosting a library, and say, "Give me one of these,
and one of those, and those.  What's my total?"

Or, does this mean I'll have to upgrade my piano to an electronic
MIDI system?  (I'd _really_ rather not...)

Mike Morrey - 1910 early Aeolian player

 [ Here's a simplified explanation.  MIDI files are typically intended
 [ to create music, not to punch a paper music roll.  For that purpose
 [ the CIS image file or equivalent should be preserved along with
 [ the MIDI file(s).  Then you can simply send the image file to a
 [ perforating firm to have your custom copies punched.  See also
 [ http://www.mmdigest.com/Archives/Digests/201810/2018.10.01.03.html 
 [ -- Robbie