Output to single PDF and multiple MIDI files

[Jérôme Plût]

I am typesetting a multi-movement work. I want the paper output to be
in a single file (say work.pdf) and the MIDI output to be in separate
files (work-1.pdf, work-2.pdf). Is there a simple and local way to do
this?

I can do it in a not-simple-enough way:

first = \relative { c'4 c c c }
second = \relative { c'4 d e f }

\book {
  \score { \new Staff << \first >> }
  \score { \new Staff << \second >> }  % here
}
\book { \bookOutputSuffix "1"
  \score { \new Staff << \first >> \midi { } } }

\book { \bookOutputSuffix "2"
  \score { \new Staff << \second >> \midi { } } } % and here

However, this is not *local*. What I mean is that if I want to comment
out, say, the second movement (for a test run), I need to comment two
places at once (marked “here” “and here” in the source above). For
consistency and efficiency, I want all lines relating to a single
movement to be grouped together. Besides, I also have some reasons to
want to group the source of the music with the \score commands; my
preferred file structure would be:

% first movement
music = \relative { ... }
\score { ... } % paper output to work.pdf
\score { ... } % MIDI output to work-1.midi

% second movement
music = \relative { ... }
\score { ... } % paper output appended to work.pdf
\score { ... } % MIDI output to work-2.midi


I also tried a variant, resetting the name of the book:

\book { \bookOutputName "work" \score { \new Staff << \first >> } }
\book { \bookOutputName "work" \score { \new Staff << \second >> } }

There would be two consistent ways to act here: the second score
could either overwrite the first one or add some extra pages.
(Concatenation would be more useful, obviously). However lilypond
chooses a bizarre third option: the code above produces two files
named work.pdf and work-1.pdf .

Does this problem have any solution?

Thanks,

--
        Jérôme Plût