Re: Acciaccatura stem / tie direction

[Dirck Nagy]

Thanks Knute.

The slur position changes, but stem direction also needs to be changeable, 
without affecting the following (non-grace) notes.

Isn't this a pretty significant bug?  I'm not sure how to report this.

Stem direction should almost always point up, even if there is music in another 
voice.

I'm surprised there aren't more issues with this.  Grace notes like this are 
very common.  Here is an example from Liszt's Mazeppa .  This continues for 22 
more measures.

[cid:a9eb22d2-92eb-4d77-94b0-08333f5ee9b1]

A command like "Grace.Up" or a sign such as "^" or "_"   in front of 
\acciaccatura would be easiest for the user.  It would need to change slur and 
stem direction, and then reset these to match the following non-grace notes.    
Could something be written into Lilypond?

I have no idea how to begin.

thanks

dirck


________________________________
From: Dirck Nagy <dirckn...@hotmail.com>
Sent: Sunday, July 13, 2025 12:00 PM
To: Lilypond-User Mailing List <lilypond-user@gnu.org>
Subject: Acciaccatura stem / tie direction

Dear Lilypond

How can I (globally) manipulate the tie / stem direction of acciaccature, grace 
notes, appoggiaturae?

Here are two simplified examples:

The first example (acciaccatura example) is correct

[cid:ad347971-5194-4cd0-a45a-8bb2fbadb7a3]

The second example uses my simplified piano template.  I am unable to get the 
stem direction and tie / slur to display correctly, short of adding commands to 
each individual note.

Is there a problem with my template?  Please note that there is no music 
present in any other voice in this example.

[cid:beb5c7e1-8258-4389-8eb8-86ce65d3904d]

Changing stem direction also changes the stem direction of the grace note.

I have a piece which uses a lot of acciaccature, so changing each of these 
individually would be very time-consuming.

Code for both is at bottom.

Thanks in advance

dirck

Acciaccatura example:

\header{
  title = "acciaccatura example"
}

\relative c''
{
 c1 \acciaccatura g'8 <g g'>4 g g g
}

\version "2.22.1"

Simplified piano template
\version "2.22.1"

\header {

  title = "simplified piano template"

}


global = {
  \key c \major
  \numericTimeSignature
  \time 4/4

}

rightOne = \relative c'' {
  \global

  % Music follows here.
 c1 \acciaccatura g'8 <g g'>4 g g g
}

rightTwo = \relative c'' {
  \global
  % Music follows here.

}

rightThree = \relative c' {
  \global
  % Music follows here.

}

rightFour = \relative c' {
  \global
  % Music follows here.

}

SpacingVoice = \relative c' {
  \global
  % Music follows here.

}

leftOne = \relative c' {
  \global
  % Music follows here.
s1 s1
}

leftTwo = \relative c' {
  \global
  % Music follows here.

}

leftThree = \relative c' {
  \global
  % Music follows here.

}

leftFour = \relative c' {
  \global
  % Music follows here.

}

\score {
  \new PianoStaff  <<
    \new Staff = "right" \with {
      midiInstrument = "acoustic grand"
    } << \rightOne \\ \rightTwo \\ \rightThree \\ \rightFour \\ \SpacingVoice >>
    \new Staff = "left" \with {
      midiInstrument = "acoustic grand"
    } { \clef bass << \leftOne \\ \leftTwo \\ \leftThree \\ \leftFour>> }
  >>

}