Re: Learning how to use "\change Staff"; don't get it yet, obviously

[Valentin Petzel]

Hi Ken,

you have two different scores, one that produces a score and one that produces 
midi (is there any specific reason not to use one score with both \layout { } 
and \midi { }?).

The first one works fine, the seconds creates problems. Basically what’s 
happening is that you never actually names any staves "RH" or "LH", so 
Lilypond cannot chance context. Change the \new Staff lines to \new Staff = 
"..." and it will work. Caveat: Changing contexts might fail if these context 
to be changing into is not alive at that time, e.g. due to a line break.

This means that when doing such things you need to make sure that the context 
you want to change into is alive, for example by filling the staves with

<< 
 \rh
 #(skip-of-length lh)
>>

or even

<< 
 \rh
 #(skip-of-length rh)
 #(skip-of-length lh)
>>

Cheers,
Valentin



Am Samstag, 30. Juli 2022, 23:48:59 CEST schrieb Kenneth Wolcott:
> Hi;
> 
>   I'm learning how to engrave music that changes from one staff to another.
> 
>   I, obviously, do not understand yet how to do this, even after
> reading the pertinent section in the Notation Reference.
> 
>   My attempt to engrave the first three bars of the harp score of Swan
> Lake fails with the following:
> 
> Swan_Lake.ly:40:3: warning: cannot find context to change to: Staff = RH
> 
>   \change Staff = "RH"
> Swan_Lake.ly:22:3: warning: cannot find context to change to: Staff = LH
> 
>   \change Staff = "LH" <> s4                                    | % m01
> 
>   I have attached a screenshot of the first three bars of the harp
> score of Swan Lake, my LIlypond source code and the result of my
> engraving attempt.
> 
>   I don't think that there's anything wrong with Lilypond, and there's
> nothing wrong with the documentation, but this Lilypond user is a bit
> dense.
> 
>   If I can just get the first bar engraving correctly, I think I can
> make it the rest of the way :-)
> 
> Thanks,
> Ken Wolcott

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