Or even

\version "2.24.0"

pa = \fixed c' {
  \scaleDurations 4/5 {
    \cadenzaOn r2 g \glissando \hideNotes c'4 \unHideNotes \cadenzaOff
  }
  a1
}

pb = \fixed c' { R1 R1 }

\score {
  \new StaffGroup <<
    \new Staff \pa
    \new Staff \pb
  >>
}

On 29/09/2025 21:04, Leo Correia de Verdier wrote:
Is it perhaps as simple as:

%%%%%%%%%%%%%%%%%%%%%%%
\version "2.25.28"

pa = \fixed c' {
   r2 g2*4/5 \glissando \hideNotes c'8*4/5 \unHideNotes
% or other note values and fractions to taste
   a1
}

pb = \fixed c' { R1 R1 }

\score{
   \new StaffGroup <<
     \new Staff \pa
     \new Staff \pb
   >>
}
%%%%%%%%%%%%%%%%%%%%%%

?

29 sep. 2025 kl. 20:50 skrev Paul Scott<[email protected]>:


On 9/29/25 11:10 AM, Timothy Lanfear wrote:
On 29/09/2025 18:32, Yoshiaki Onishi wrote:
Dear Paul,

If this thread addresses your question:

https://lists.gnu.org/archive/html/lilypond-user/2025-02/msg00189.html

I think you are basing your MWE off of this, am I right?

https://lilypond.org/doc/v2.25/Documentation/snippets/expressive-marks-_002d-contemporary-glissando

In the referenced message thread you will find that there are people (myself 
included) who pointed out that it should be updated with the one using \after 
function.

Yoshi
I believe Paul's problem is related to time synchronisation of the cadenza. 
This should work:

\version "2.24.0"

pa = \fixed c' {
   \cadenzaOn r2 g \glissando \hideNotes c'4 \unHideNotes \cadenzaOff
   a1
}

pb = \fixed c' { R1*5/4 R1 }

\score { << \pa \pb >> }

The first full measure rest must be the same duration as the cadenza. 
\cadenzaOn should come at the beginning of the measure. See 
alsohttps://lilypond.org/doc/v2.24/Documentation/notation/special-rhythmic-concerns#aligning-to-cadenzas
 for handling longer cadenzas without counting up the number of beats. (and use 
Yoshiaki's suggestion to handle the glissando).

Hoping to not have to put the *5/4 in every instrument's part. My normal score 
would be something like this:

\version "2.25.29"


timing = {
   s1*5/4 s1
}

pa = \fixed c' {
   r2 \cadenzaOn g \glissando \hideNotes c'4 \unHideNotes \cadenzaOff
   a1
}

pb = \fixed c' { R1 R1 }

\score{
   \new StaffGroup <<
     \new Staff << \timing \pa >>
     \new Staff \pb
   >>

}

Paul



--
Timothy Lanfear, Bristol, UK.

--
Timothy Lanfear, Bristol, UK.

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