Re: Issue 1586 in lilypond: midi cresc happens instantly

[lilypond]

Comment #5 on issue 1586 by percival.music.ca: midi cresc happens instantly
http://code.google.com/p/lilypond/issues/detail?id=1586

If we print a list of midi events, then we wouldn't just see CHANGES.  We'd  
see:
-176 07 53
-144 60 0
-176 07 69
-144 62 0
-176 07 82
-144 64 0
-176 07 90
-144 65 0
+144 60 53
+144 62 90
+144 64 90
+144 65 90

Granted, if there's a bunch of changes happening at the same time, then it  
would be easy for this to slip through the cracks... but at least there's  
an actual easy-to-understand (once you're looking for it) record of just  
what's happening.

I also like your idea of a "round trip" midi png comparison.  It would be  
neat to do that with musicxml2ly if we ever add that backend.  But I still  
think that printing the midi events to a text file, then calling diff on  
those text files, is the easiest way of leveraging our existing regtest  
system.