Thank you sooo much for your answer!
That’s amazing, it’s really clear and I’ll take a deep look at it!

What is MusicSE? I cannot find anything on google. Can u point me out to the 
reference u said?

Cheers!

> On 3 Oct 2023, at 09:15, Valentin Petzel <valen...@petzel.at> wrote:
> 
> You are doing
> 
> << { c'2. } \new Voice { \redDotMultiMeasureRest R1 } >>
> 
> but a 3/4 measure only has length 2. . So do
> 
> << { c'2. } \new Voice { \redDotMultiMeasureRest R2. } >>
> 
> instead.
> 
> While you are at it: You can directly boxify the stencil using box-stencil 
> without going the extra way over a markup. Also you could format your code in 
> a more readable manner (which helps understanding problems) like this:
> 
> \version "2.22.0"
> \language english
> boxify =
> #(define-music-function
>  (grob-path) (key-list?)
>  (define proc
>    (grob-transformer 'stencil
>                      (lambda (grob orig) (box-stencil orig 0.1 1.25))))
>  #{ \override $grob-path . stencil = #proc #})
> 
> #(define (center-stencil stil)
>   (ly:stencil-aligned-to (ly:stencil-aligned-to stil X CENTER) Y CENTER))
> 
> redDotMultiMeasureRest = {
>  \override MultiMeasureRest.stencil =
>  #(grob-transformer
>    'stencil
>    (lambda (grob default)
>      (ly:stencil-translate-axis
>       (center-stencil (ly:text-interface::print grob))
>       (interval-center (ly:stencil-extent default X))
>       X)))
> 
>  \override MultiMeasureRest.text = "."
>  \override MultiMeasureRest.font-size = 10
>  \override MultiMeasureRest.color = "#FF0000"
> }
> 
> \header { tagline = ##f }
> 
> \score {
>  \new RhythmicStaff {
>    \override Score.SpacingSpanner.strict-note-spacing = ##t
>    \set Score.proportionalNotationDuration = #(ly:make-moment 1/8)
>    \set Timing.beamHalfMeasure = ##f
>    \override Staff.MeasureCounter.staff-padding = #4.5
>    \set Staff.midiInstrument = #"acoustic grand" \key c \major
>    \numericTimeSignature \time 3/4 \clef treble
>    \startMeasureCount \hideNotes
>    << { c'2. } \new Voice { \redDotMultiMeasureRest R2. } >>
>    << { 4 4 4 } \new Voice { \redDotMultiMeasureRest R2. } >>                 
>                                       
>    \stopMeasureCount \bar "||"
>  }
>  \layout {
>    \context {
>      \RhythmicStaff
>      \consists Measure_counter_engraver
>      \boxify MeasureCounter
>    }
>  }
> }
> 
> Cheers,
> Valentin
> 
> Am Dienstag, 3. Oktober 2023, 05:39:53 CEST schrieb Rajesh Baskar:
>> Hi,
>> 
>> Can someone please help me? I'm trying to hide the notes and display a
>> red dot in the middle. This below should have only 2 measure but it
>> prints 3 and there are some errors.
>> 
>> Thanks,
>> Raj
>> 
>> \version "2.22.0" \language english
>> boxify = #(define-music-function (grob-path) (key-list?) (define proc
>> (grob-transformer 'stencil (lambda (grob orig)
>>             (grob-interpret-markup grob
>>               #{ \markup \override #'(box-padding . 1.25) \override
>> #'(thickness . 1)
>>                  \box \stencil #orig #})))) #{ \override $grob-path .
>> stencil = #proc #})
>> #(define (center-stencil stil) (ly:stencil-aligned-to
>> (ly:stencil-aligned-to stil X CENTER) Y CENTER))
>> redDotMultiMeasureRest = { \override MultiMeasureRest.stencil =
>> #(grob-transformer 'stencil (lambda (grob default)
>>                            (ly:stencil-translate-axis (center-stencil
>> (ly:text-interface::print grob)) (interval-center (ly:stencil-extent
>> default X)) X)))
>>                            \override MultiMeasureRest.text = "."
>>                            \override MultiMeasureRest.font-size = 10
>>                            \override MultiMeasureRest.color = "#FF0000" }
>> \header {tagline = ##f } \score {\new RhythmicStaff { \override
>> Score.SpacingSpanner.strict-note-spacing = ##t
>>                                                       \set
>> Score.proportionalNotationDuration = #(ly:make-moment 1/8)
>>                                                       \set
>> Timing.beamHalfMeasure = ##f
>>                                                       \override
>> Staff.MeasureCounter.staff-padding = #4.5
>>                                                       \set
>> Staff.midiInstrument = #"acoustic grand" \key c \major
>> \numericTimeSignature \time 3/4 \clef treble
>> \startMeasureCount \hideNotes
>>                                                       << { c'2. } \new
>> Voice { \redDotMultiMeasureRest R1 } >>
>>                                                       << { 4 4 4 } \new
>> Voice { \redDotMultiMeasureRest R1 } >>
>> \stopMeasureCount \bar "||"}
>>                                  \layout { \context { \RhythmicStaff
>> \consists Measure_counter_engraver \boxify MeasureCounter } } }
> 


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