Hi all,

I am trying to extend the default event-listener.ly to also include information 
about in which voice a specific note is being played.
When the voice is defined using 

\new Voice = voicename

I can retrieve the retrieve that name through (ly:context-id 
(ly:translator-context engraver)). 
When the voice is defined in an anonymous way context-id is an empty string. 
I have been trying to set the context-id when none is set using a counter, but 
that fails because of an "missing typecheck for property 'context-id'" error.
I tried to use both a normal list as well as an asoc list to keep track of the 
different Voice contexts in order to tell them apart but I haven't been able to 
get that to work.

I know that when lyrics are added, it is possible to refer to those anonymous 
voices by using "1" etc.
Looking through the code which does this 
(lily/lyric-combine-music-iterator.cc), I gather that the lyrics adding process 
searches for the a voice matching a certain id.

I would like to be able to mark a voice in Scheme in such a way that I can 
print to which voice a certain note belongs. Could anyone give a clue on how to 
achieve that?

Thanks in advance!

Maurits
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