Re: \mark and slur

[Malte Meyn]

Am 14.09.2017 um 11:14 schrieb Gianmaria Lari:
>    c4 c c d
>    (c4) c c c

[…]

>    c4 c c d
>    \mark "X" (c4) c c c

The start of slur belongs to the d, not the c.

Writing
        d (c)
is possible and equivalent to
        d( c)
but the latter more clearly says what’s going on.

You tried to write
        d \mark X (c)
so the \mark X goes between the d and the (. This cannot work, it has to be
        d( \mark X c)
I would strongly recommend to put slur, beam, tie, … starts directly 
after the note they belong to instead of directly in front of the next 
note to avoid these situations.