English pronunciation question

By far the most common pronunciation of again, in all parts of the United States, is /əˈgɛn/ Show Spelled Pronunciation [uh-gen] Show IPA , with the same vowel heard in yet and pep. The pronunciation /əˈgeɪn/[uh-geyn], rhyming with pain, occurs chiefly in the Atlantic states. Again said as /əˈgɪn/[uh-gin], with the vowel of pit or sip, or with a vowel somewhere between /ɛ/[e] and /ɪ/, is the common pronunciation in much of the South, where /ɛ/[e] and /ɪ/ tend to become neutralized, or more like one another, before /m/[m] and /n/[n], leading to a lack of noticeable distinction between such pairs as pen and pin, ten and tin.