[musicxml2ly] duplicated dynamics and hairpins when using multiple voices

[Florian Grundig]

Hi all,

I’ve encountered a strange behaviour when converting a musicXml document 
(exported from MuseScore 3.0.5) with two or more voices per staff in 
combination with dynamics or hairpins -> the ly file contains the dynamics and 
the hairpins for each voice so they are also rendered several times which looks 
buggy.

This is the created ly file: looks like:

\version "2.18.2"

\score {
    <<
            \context Staff = "1" <<
               \relative a' { a1 \p \bar "|." }
               \relative f' { f1 \p \bar "|." }
                >>
            >>
    }
^ there’s one \p element per voice but that seems wrong -> the musicXML 
standard doesn’t require a voice property for a direction element


I’ve attached the musicXML file the generated test.ly <http://test.ly/> file 
and a generated svg file which shows the rendered content.



With kind regards 
Florian