Ack! Sorry for taking to long to answer your question! It’s just a very hard question to answer.
When you say “ㅐ”, it comes from the top of the throat, towards the front. It has more of a rounded sound and is higher in terms of pitch. To me, it sounds more like an “a”, but the difference in pronunciation is minimal.
“ㅔ” is much lower and comes from the bottom of the throat and towards the back. The way I pronounce it is a little more monotone than “ㅐ”, to help make it sound deeper.
I’ve actually made a video to help make the difference, but not sure that it would be helpful. When I was listening back to it, I couldn’t hear any difference and I’m the one who said it, but if you want to hear it, just send us another ask and I can upload it to tumblr. Hope that was helpful, but if it wasn’t don’t hesitate to ask us again!