Re: Cross-staff glissando with crescendo and dynamics

[Leo Correia de Verdier]

Hi David!

The issue, put in a slightly simplified way, is that the Voice context to which 
the dynamics are attached has moved away from the Staff under which the 
dynamics were originally aligned, leaving lilypond ”in doubt” about under what 
staff the \mp should be.

The answer in the linked thread solves this by creating a second Voice for the 
dynamics, that stays in the original Staff.

The other solution mentioned, which I’d prefer (but that may be a matter of 
taste) would be creating a separate Dynamics context.

HTH
/Leo

> 22 mars 2022 kl. 13:55 skrev David Santamauro <david.santamauro@gmail.com>:
> 
> So I figured it out based on:
>  
> https://lists.gnu.org/archive/html/lilypond-user/2016-07/msg00266.html
>  
> Not an unreasonable solution, but I still don't quite understand the 
> underlying issue.
>  
> Thanks
>  
>  
> From: David Santamauro <david.santamauro@gmail.com>
> Date: Tuesday, March 22, 2022 at 8:36 AM
> To: lilypond-user@gnu.org <lilypond-user@gnu.org>
> Cc: GMAIL <david.santamauro@gmail.com>
> Subject: Cross-staff glissando with crescendo and dynamics
> 
> Hi, I'm not understanding the warnings I'm getting with the following 
> snippet. I've included a possible work-around that is musically identical, 
> but visually unappealing:
>  
> %%%%%%
> \version "2.22.2"
>  
> \include "english.ly"
>  
> \score {
>   \new PianoStaff \with { instrumentName = "Harp" } <<
>     \new Staff = "s_harp_upper" {
>       \relative c'' {
>         \clef "treble"
>         s1        |
>         s4 r4 r2  |
>  
>         % work around without warnings
>         R1*2
>       }
>     }
>     \new Staff = "s_harp_lower" {
>       \relative c {
>         \clef "bass"
>  
>         f,1\p\glissando\<
>         \change Staff = "s_harp_upper"
>         bf'''4\!\mp
>         \change Staff = "s_harp_lower"
>         r4 r2
>  
>         % work around without warnings
>         f,,,1\p\glissando\< \clef "treble" bf'''4\!\mp   r4 r2
>       }
>     }
>   >>
> }
> %%%%%%
>  
> For the cross-staff I get 4 of these:
>  
> programming error: My pure_y_common is a VerticalAlignment, which might 
> contain several staves.
> continuing, cross fingers
>  
> Can someone explain what those warnings mean and how to code the cross-staff 
> gliss with dynamics and crescendo. correctly?
>  
> Thanks