Le 07/06/2021 à 23:57, Molly Preston a écrit :
Hi again.

I am trying to get a trill spanner over a quarter note tied to a whole note and through that measure.

\new Staff {
    r2 r4 c' ~  \startTrillSpan|
    << { c'1 \< } \\ {s4 s s s \stopTrillSpan } >>
    d'1\f  |
  }

I tried to use the spacer rests for this but it doesn't seem to do what I want and the tie and crescendo aren't working here either.

Any help or explanations would be helpful.

Hello,

Tie and crescendo are not working because the << \\ >>
construct instantiates new, dedicated voices. More
information is at

http://lilypond.org/doc/v2.22/Documentation/notation/multiple-voices#single_002dstaff-polyphony

To let the trill spanner extend to the end of the
score, just never end it.

\version "2.22.0"

\new Staff {
  r2 r4 c'~\startTrillSpan |
  c'1 \< |
  d'1\f  |
}

Regards,
Jean

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