The difference between the North Carolina singers and West Virginia singers may simply be the difference in the tonal quality of our speech, which would make a distinct difference in the ornamentation. We West Virginians tend to have a nasal twang to our voices, (and also eastern Kentucky.) Most of the people I know from the North Carolina mountains have a softer, southern but not real nasal twang. Hazel Dickens is an excellent example of what I grew up thinking of as the "old way" of singing. My grandfather, from eastern Kentucky (and a primative Baptist to boot!) sang in the same style with very similar ornamentation. Both are very nasal. Similar singing that I have heard here in North Carolina is tonally different because, I think, it is not as nasal.