Re: Stem direction of grace notes when main note is stemDown

[Jean Abou Samra]

Le 12/06/2022 à 00:52, Knute Snortum a écrit :
> I'm confused, which often means I'm missing something, so bear with me.
>
> I have always thought that a grace note's stem is up no matter what.
> But LilyPond's default is to engrave a grace note's stem down if the
> main note's stem is down:
>
> { \voiceTwo c'4 c' c' \acciaccatura d'8 c'4 }
>
> ...which forces one to do something like this:
>
> { \voiceTwo c'4 c' c' \acciaccatura { \stemUp d'8 } \stemDown c'4 }
>
> Even then, the slur goes from the head of the grace note to the tip of
> the stem in the main note, when I think it looks better when the slur
> goes head to head.
>
> LilyPond has engraved grace notes down stem when the main note is down
> stem since at least 2.18.2, but this seems wrong.  Shouldn't the
> default be always stem up?



What would you then do with

<<
  { g'4 g' g' \acciaccatura a'8 g'4 }
  \\
  { c'4 c' c' \acciaccatura d'8 c'4 }
>>

?

I don't have Gould at hand right now, but my clue is that the
rule reads: in single-stemmed writing, grace notes are always
up, even if their natural direction would be down, as in

{ c''4 c'' c'' \acciaccatura d''8 c''4 }

In double-stemmed writing, however, I don't believe it's
standard to do that.

Best,
Jean