Re: Strange beams on cross-staff tremolos

[Paolo Prete]

Instead of suppressing the warning, given that LilyPond adds an invisible "auxiliary" stem to the whole notes, for creating the tremolo beam,

I think it should be better to explicitly set the stems on both notes, according to the beam's position:

%%%
\version "2.22.0"

upper = { s1 }

lower =  {
  \clef treble
  \override Beam.positions = #'(10 . 11)
  \repeat tremolo 8 { \stemUp c''''16 \change Staff = "upper" \stemDown c''''16 }
}

\score {
  <<
    \new Staff = "upper" \upper
    \new Staff = "lower" \lower
  >>
}
%%%

On Wed, Nov 3, 2021 at 3:48 PM Knute Snortum <ksnortum@gmail.com> wrote:

On Wed, Nov 3, 2021 at 5:44 AM Paolo Prete <paolopr976@gmail.com> wrote:
>
> Hello,
>
> I'm experiencing strange beams on cross-staff tremolos on whole notes.
> The beam in the below snippet: 1) is not placed at the middle of the two notes and 2) it is too close to the ledger lines.
>
> Is this expected?
> Is there a way to fix 1) + 2) without \tweak(ing)?
>
> thanks,
> P
>
> %%%%%%%%%%%%%%%%%%%
> \version "2.22.0"
>
> upper = { s1 s }
>
> lower =  {
>
> \clef treble
> \repeat tremolo 8 { c''''16 \change Staff = "upper" c''''16 }
> \break s1
>
> }
>
> \score {
>   <<
>     \new Staff = "upper" \upper
>     \new Staff = "lower" \lower
>   >>
> }
> %%%%%%%%%%%%%%%%%%%

The only way I know to fix this is by overriding beam positions.  In
this case, doing so produces a warning, which I have suppressed.

%%%
\version "2.22.0"

upper = { s1 }

lower =  {
  \clef treble
  \override Beam.positions = #'(10 . 11)
  #(ly:expect-warning (_ "weird stem size, check for narrow beams"))
  \repeat tremolo 8 { c''''16 \change Staff = "upper" c''''16 }
}

\score {
  <<
    \new Staff = "upper" \upper
    \new Staff = "lower" \lower
  >>
}
%%%

--
Knute Snortum