code: private JChordPartOfGroup getChordReallyPartOfGroup(JChordPartOfGroup chord) {
  		if (chord.m_normalizedChords != null) {
  			//should be m_normalizedChords[0]
  			for (int j=0; j<chord.m_normalizedChords.length; j++) {
  				if (chord.m_normalizedChords[j] instanceof JChordPartOfGroup) {
  					return (JChordPartOfGroup) chord.m_normalizedChords[j];
  				}
  			}
  		}
  		return chord;
  	}
docs: A JChordPartOfGroup in this group of note can have multi-length
  chords, then only one is part of group (the shortest duration' one)
  
  So, for auto stemming, stem direction... functions, if the
  JNoteElementAbstract is a JChord(PartOfGroup), returns the
  really needed chord, itself if one-length, the shortest if
  multi-length