Btw I went to college in NC so I developed an ability to mimic the southern accent. I didn't pick up on it, but it was kinda hard to understand at first.
ところで、いろんななまりをユーモラスに使いこなすスタンドアップ・コメディアン「 Russell Peters」はお勧めです。 ユーチューブで検索すれば動画がいっぱい見れますので是非お試しを! He does carricatures of accents fairly well.