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

[Valentin Petzel]

Hi Jean,

could have sworn there was some issue with contexts being alive using 
\RemoveEmptyStaves, but I fail to reproduce this ... But then, it doesn’t 
really make sense, as page breaking is done after als context magic is 
applied. I probably just messed up, that’s something I’m quite proficient at.

Best,
Valentin

Am Montag, 22. August 2022, 17:21:35 CEST schrieb Jean Abou Samra:
> > Le 22 août 2022 à 17:12, Valentin Petzel <valentin@petzel.at> a écrit :
> > 
> > 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.
> Hi Valentin,
> 
> A minor question: the statement above is something I don’t understand, what
> do line breaks have to do with contexts being alive?
> 
> Thanks,
> 
> Jean
> 
> > 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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