I have worked long and hard to avoid developing an accent, even though I've lived in several places (New York, Boston, San Antonio) known for distinctive accents, and even though both my parents had strong and very different accents (one from Brooklyn, one from the UK). I guess I probably have a New England accent if anything (but definitely not a Boston accent) - although the odd "y'all" or "wicked" does pop out occasionally, and I pronounce some words in the British style (I pronounce the "h" in "herb", for instance). Confuses the heck out of people
As for pitch, my speaking voice is fairly low-pitched even though I am a mezzo-soprano. I've never been asked if my mommy could come to the phone, even when I was 8 years old... *shrug*