code: static private void transpose_Chord(DecorableElement transp,
  			Note noneTranspKeyNote, KeySignature noneTranspKey,
  			Note lastKeyNote, KeySignature lastKey) {
  		Chord chord = transp.getChord();
  		if (chord != null) {
  			if (chord.hasNote())
  				chord.setNote((Note) transpose_Note(chord.getNote(),
  						noneTranspKeyNote, null, lastKeyNote, null));
  			if (chord.hasBass())
  				chord.setBass((Note) transpose_Note(chord.getBass(),
  						noneTranspKeyNote, null, lastKeyNote, null));
  		}
  	}
docs: Subfunction of {@link #transpose(Tune, int)} which transpose
  a Chord