The May 19, 2014 issue of the New Yorker magazine has an article on
retrieving information from early records that are too fragile or
damaged for the usual playback machinery.  There's some discussion of
preserving piano roll performances as well, all of which may be of
some interest to MMD readers.

Richard Friedman

 [ Sometimes the New Yorker makes select articles available online.  If
 [ anyone sees this article online, please send us the URL!   --Jody