2016-02-10 22:54 GMT+01:00 Federico Bruni <f...@inventati.org>:
> Hi all
>
> Do you know why the following input causes this warning?
> There's anything I can do to avoid it?
>
> \version "2.19.35"
> \relative {
>  c'1
>  \set Score.repeatCommands = #'((volta "1"))
>  d'1

Here you try to end the volta-spanner:
>  \set Score.repeatCommands = #'((volta #f))
>
Here you try to begin a new volta-spanner:
>  \set Score.repeatCommands = #'((volta "2"))
Both commands are set at the same musical moment, conflict! So Lily
tries to makes any sense of your input and throws a warning.
>  f1
>  \set Score.repeatCommands = #'((volta #f))
> }

`repeatCommands' expects a list. So put all stuff in _one_ list:

\relative {
 c'1
 \set Score.repeatCommands = #'((volta "1"))
 d'1
 \set Score.repeatCommands = #'((volta #f) (volta "2") end-repeat)
 f1
 \set Score.repeatCommands = #'((volta #f))
}

As shown in the NR ;)
http://www.lilypond.org/doc/v2.19/Documentation/notation/long-repeats#manual-repeat-marks

Cheers,
  Harm

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