Re: ChangeStaff was: OverrideBeamSettings

[Helge Kruse]

Am 15.01.2011 18:06, schrieb David Kastrup:
> David Kastrup<address@hidden>  writes:
>
> [...]
>
> ud=#(define-music-function (parser location low high) (ly:music? ly:music?)
>       #{ \change Staff = "down" $low \change Staff = "up" $high #})
>
> global={ \key es\major
>     \time 2/4  }
>
> \new StaffGroup
> <<  \set StaffGroup.beatStructure = #'(2)
>   \new Staff = "up" { \global s2*3 }
>     \new Staff = "down" { \global
>       \relative c' { \repeat unfold 2 { \ud<c es f>8<g' bes c>  }
>                     \repeat unfold 2 { \ud<c, es f>  <as' bes c>  }
>                     \repeat unfold 2 { \ud<c, es f>  <g' bes c>  } } }
> > >
Great, this makes the notation much easier. I will use it exactly in 
this way.

But there is something I don't understand. In your music-function you 
find a
    \change Staff = "down" $low .....

When I write this outside a function I get a warning when the "down" 
staff is the current staff. But when I use the function I don't:

----<>-----<>----<>-----<>----<>-----<>----<>-----<>----<>-----<>----n 
\version "2.13.31"

ud=#(define-music-function (parser location low high) (ly:music? ly:music?)
     #{ \change Staff = "down" $low \change Staff = "up" $high #})

global={ \key es\major
   \time 2/4  }

\new StaffGroup
<<
    \set StaffGroup.beatStructure = #'(2)
    \new Staff = "up" { \global s2*2 }
    \new Staff = "down" { \global
        \relative c' {
        % this 'change Staff' is also found in the \ud function
        \change Staff = "down" c8 \change Staff = "up" c8
        \repeat unfold 2 { \ud c8 c8 }
        s4 } }
>>

----<>-----<>----<>-----<>----<>-----<>----<>-----<>----<>-----<>----
|  <string>:1:69: Warnung: es kann kein Kontext zum Umschalten
|  gefunden werden
|  parseStringResult = \notemode {  \change Staff = "down"
|  \lilyvartmpe
|                \change Staff = "up" \lilyvartmpf  }

Helge