Re: Cross-staff slurs

[Jean Abou Samra]

Le 19/04/2021 à 07:47, Jacques Menu a écrit :
> Hello folks,
>
> MusicXML has the concept of a slur to a note in another staff, and 
> MusicScore provides this feature.
> The simple attempt, first attached image, doesn’t produce a 
> satisfactory result.
>
> Is there a way to obtain such a slur in LilyPond without setting 
> control points manually, as is shown in 
> https://lsr.di.unimi.it/LSR/Item?id=134 
> <https://lsr.di.unimi.it/LSR/Item?id=134>, second attached image?
>
> Thanks for your help!
>
> JM

Hi Jacques,

LilyPond does support cross-staff slurs. In your example, it thinks the 
slur is going to look ugly if crossing the staves, and chooses a less 
steep option.

You can increase the demerit for slurs with end points too far from the 
note heads to force it to span the total vertical interval between the 
heads:

\new PianoStaff <<
  \new Staff = "right" {
    \override Slur.details.edge-attraction-factor = 1000
    e'''2(
    \change Staff = "left"
    a4)
    \change Staff = "right"
    b''8 r |
  }
  \new Staff = "left" {
    \clef bass
    s1
  }
>>

See:

http://lilypond.org/doc/v2.22/Documentation/internals/slur_002dinterface

Cheers,
Jean