Re: Ambitus_engraver causes ghost laissezVibrer ties on first note of Voice

[Valentin Petzel]

I have nothing against ghosts, just against this type of ghost.

This is the user mailing list. For requests like "please fix this" you might 
also send this to the bug mailing list. If you need a quick fix: Adding an 
empty grace column \grace{ s } before the first note will fix this, as will 
putting the whole thing into a single note chord <a'\laissezVibrer>. I suppose 
that the Ambitus_engraver creates the Ambitus Note Heads in the same timestep 
as the first Note Column, which results in them being acknowledged by the 
engravers for semi-ties.

Cheers,
Valentin

Am Mittwoch, 23. März 2022, 06:16:42 CET schrieb Jeff Olson:
> Do you like ghosts?
> 
> Putting an LV tie on the first note of a Voice in which there is an
> ambitus generates two unwelcome "ghost" LV ties floating unattached
> above and below the note, in addition to the desired single LV tie that
> is properly attached to the note.  Here is the MWE (see also attached
> image Ambitus-LV-ghosts.png):
> 
> \version "2.22.0"
> \new Voice \with { \consists "Ambitus_engraver" } {
>    a'\laissezVibrer c'' c'
> }
> 
> In this example, the c'' and c' are necessary to establish a range for
> the ambitus to display that is distinct from the note with the proper LV
> tie.  By experimenting with these notes (or simply by visual inspection
> of the output) you see that the two floating ghost LV ties are at
> vertical positions within the first note column that match the two
> extrema of the ambitus.  They are the same LV ties that would be
> properly expected had the ambitus extrema been included as notes in a
> chard with the first note, like this:
> 
> <a' c'' c'>\laissezVibrer
> 
> So the vertical position of the ghosts is determined by the ambitus even
> though their horizontal position is in the first note column.
> 
> This behavior exists at least in 2.22.1 and 2.18.2.  Log files are clean.
> 
> The ghosts disappear when the LV tie is not on the first note (e.g. just
> add initial g'):
> 
> \new Voice \with { \consists "Ambitus_engraver" } {
>    g' a'\laissezVibrer c'' c'
> }
> 
> The ghosts also disappear if the ambitus belongs to the Staff context
> (just change Voice to Staff):
> 
> \new Staff \with { \consists "Ambitus_engraver" } {
>    a'\laissezVibrer c'' c'
> }
> 
> I don't like ghosts.  Please fix.
> 
> Jeff

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