Re: Repeat 8va

[H. S. Teoh]

On Sat, Jan 09, 2016 at 12:11:48AM -0600, address@hidden wrote:
> On Fri, 8 Jan 2016, Christopher R. Maden wrote:
> > Generally, once you get into any kind of moderately complicated
> > score, you have to concoct your score and MIDI separately, e.g.:
> >
> > theTune = c c c c
> > theScore = \repeat volta 2 { \theTune }
> > theMidi = \theTune \transpose c c' \theTune
> > \score{ \theScore \layout{} }
> > \score{ \theMidi \midi{} }
> 
> This is pretty much exactly what I do for a similar instruction in an
> original ragtime piece.
> 
> It's a shame that LilyPond's requirement to completely evaluate music
> expressions immediately, and therefore once and for all, forces this
> kind of thing on us.  The natural thing to want to do would be to have
> an "if (MIDI) { }" kind of construction at the point in the music
> where there's a difference; but that's simply impossible the way
> LilyPond currently works.  And so anyone who wants both a printed
> score and MIDI is forced to write the whole thing twice over,
> attempting to keep the two versons updated relative to each other by
> hand, with the ability to share code only at the lowest levels of the
> hierarchy.
[...]

This is not really true. What I usually do is something like this:

        music = <<
                \new Staff {
                        a1 b c
                        \tag #'midi { a8 r b r c r }
                        \tag #'layout { a4-. b-. c-. }
                }
        >>

        \score {
                \removeWithTag #'midi \music
                \layout {}
        }
        \score {
                \removeWithTag #'layout \music
                \midi {}
        }

The \tag #'layout and \tag #'midi lines basically behave like an if
(MIDI) block. This lets you intersperse layout-specific and
midi-specific stuff in the same place, so that you don't forget to
update one after editing the other.


T

-- 
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