When you (re)define an identifier for a \translator, it will not
applied to the current \paper until you specify it inside a
\translator section. The following example shows how you can
set different context properties at different places.
\score{
\notes\relative c''{ c4 d e f | r8 r r4 c2}
\paper{
% Global declarations that can be done in a separate file
% included here:
VoiceContext = \translator{\VoiceContext noteHeadStyle="cross";};
\translator{\VoiceContext}
% Settings for this specific score
\translator{\VoiceContext restStyle = "mensural";}
}
}
/Mats