private Clef ParseClef(string str)
{
switch (str.ToLower())
{
case "g2":
case "treble":
return Clef.G2;
case "f4":
case "bass":
return Clef.F4;
case "c3":
case "tenor":
return Clef.C3;
case "c4":
case "alto":
return Clef.C4;
case "n":
case "neutral":
return Clef.Neutral;
default:
return Clef.G2; // error("clef-value", AlphaTexSymbols.String, false);
}
}