I've toyed with the "Standard American" accent, and being a Chinese-Canadian (who's also pedantic and wants to be right all the time), I find it difficult to manage. I'm simply not used to opening up my vowels so much, except when I'm singing, which is neat.
I suppose I'm accustomed to the American accent because I'm exposed to it all the time. My singing group had a workshop last week, and we got to talking about the American accent. The guy leading the workshop remarked how impressed he was that we all pronounced "sorrow" the same way (
sore-row) and how Americans have trouble pronouncing it that way, pronouncing it
sahr-row, with a more open
ah sound. He told us that his wife was instructed by her singing group (in L.A.) to pronounce it
sahr-row to match everyone else. That'd be weird to a Canadian, but I hear it's the same for voice actors. To get work for larger companies, you have to be able to at least
simulate an "American" accent.
Here's actress Amy Walker
demonstrating various accents.