No. By muffled, I mean the depth of their voices. It sounds so soft and liquidy that you can't hear it increased. Only Abe has a half muffled voice.
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If by muffled you mean quiet, then i'd assume it's because they've been trying to avoid beatings their entire life, and you don't want to be caught chatting with others when you're a slave.
If you mean they just sound weird... uhhh... mouth shape/structure?
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