I heard Ian Paisley preach on a Web site a week ago. His speech pattern was neither typically British or Irish, and had more than a hint of Appalachia in it. Hard "r"'s, dipthongs, and other hints of the Eastern mountains of the United States. OTOH, Dolly Parton has expressed her feelings of kinship with the Ulster folks.
Is a "dipthong" a type of footwear you dip in the water when at the beach ?