Acshully, in BOS -tuhn, the "Bos" is pronounced exactly the same as "boss". Course, if you're a USn you'll mispronounce "boss" anyways, saying something which sounds to my antipodean ear like "baws". I've been to your Boston a coupla times, but I've been to the real Boston more often. And that's how they pronounce it. Deepest, darkest Lincolnshire!