On Wed, 25 Mar 2020 at 19:14, Paolo Prete <paolopr...@gmail.com> wrote:
>> > Please consider this (tested on 2.19.84):
>> >
>> > \new Voice <<
>> >   {  \shape #'((0 . 0) (0 . 0) (0 . 0) (3 . 0)) Tie c' ~ c' }
>> >   {  \shape #'((0 . 0) (0 . 0) (0 . 0) (0 . 0)) Tie c'' ~ c'' }
>> >>>

I haven't seen this construction before ( \new Voice << { } { } >>).
You should either have two separate Voices or put a "\\" in between
the two music expressions, so that lilypond will split it into two
voices. Otherwise LilyPond is trying to add two ties at the same time
in the same voice which means you can't override it twice

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