Temporary parts.

[Ralph Little]

Hi,
Some time back I posted a question regarding how to introduce a
temporary ossia in an instrumental part for just a few bars on a
separate staff, and was messing with all kinds of things to achieve
this.
In the end, the simplest solution was the best, and I can't for the life
of me see why I didn't think of it straight away.

The problem was how to have a staff appear and disappear for just the
duration of the ossia and align with the part that it is accompanying.
The neatest way I could find was to use the \RemoveEmptyStaffContext to
only reveal the staff when containing the ossia part:

Here's an example.
-------------------------------------------------------------------
TopNotes=\notes {
        \relative c' {
                c1 d e f g a b c b a g f e d c
                c1 d e f g a b c b a g f e d c
                c1 d e f g a b c b a g f e d c
        }
}

BottomNotes=\notes {
        \relative c' {
                R1*15 c1 d e f g R1*20
        }
}

\score {
        \notes {
                \context StaffGroup {
                        <<
                                \context Staff=Top {\TopNotes}
                                \context Staff=Bottom {\BottomNotes}
                        >>
                }
        }
        \paper {
                \translator {
                        \StaffGroupContext
                        \remove System_start_delimiter_engraver
                }
                \translator {\RemoveEmptyStaffContext}
        }
}

-------------------------------------------------------------------
Sorry if this is obvious; it was a revelation to me at the time :)

Ralph

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