Voice is mutable. You often change your voice to meet the requirements of your surroundings. If you grow up in Texas, you’re going to have a Southern drawl. If you move to the New York, you may get used to saying “cawfee” instead of “coffee.”
Whether your voice is monotone, raspy, or squeaky, or you’re in church, at school, or at home, you always consider the audience and try to match their style. We’re all voice actors, especially the woman behind Siri.