Sorry if this was already covered in Jeongeun's audio blog, but I'm not advanced enough to understand those (yet!).
I'm just curious where Jeongeun is from because her accent seems very different from what I've heard from other speakers so far--her 아 especially (in phonetics terms, it sounds like the low back vowel [ɑ] instead of the usual low front vowel [a]). Or is this something widespread in the younger generation?
Thanks for any insights, and thanks to Jeongeun for adding some more variety to the accents!
정은 is from Seoul, (and btw she's now a university student! congratulations 정은! lol) and in Korean, there's no distinct difference between the two different "a" sounds that you mentioned any more, and no distinct difference between the two different "e" sounds (애 and 에) as well. So I think it really depends on the person. But she talks in a more casual situation, she also tends to say things really quickly so her "a" sounds aren't so clearly pronounced