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Audio_element_info::origin_contexts

From: David Santamauro
Subject: Audio_element_info::origin_contexts
Date: Thu, 30 Jun 2011 07:18:47 -0400 
Hi,

General question about Staff_performer::acknowledge_audio_element()

given:

      Context* c = inf.origin_contexts (this)[0];
      string voice;
      if (c->is_alias (ly_symbol2scm ("Voice")))
        voice = c->id_string ();

... when does 

  if (c->is_alias (ly_symbol2scm ("Voice")))

ever return false?

thanks,

David
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