I don't understand why you call falsetto is a type of headvoice . Falsetto in Brett Manning's term is higher , airy and don't use vocal cords to make it . However , Head voice is higher than falsetto . I don't think I can make a real falsetto (don't use vocal cords) into any strong voice . But headvoice can . So , in your terminology , there are two(or more?) type of headvoice that one use vocal cords and other don't , right ?