yes, it's in the notes. There wasn't enough room for sounds when I added the new memory options. However, you can edit sounds in an earlier version, and then import them as binary, the address for each sound is provided. Most people don't use sounds as they can be buggy. Or you can use version 4H if you prefer.
I am importing as binary because version 4H crash with my game. It's weird. Thank you.
in general, people don't use AGD's sound effects code because it seems to be buggy. It's not a perfect system. AGDX is mainly an improved editor, but if I find a way to fix a bug without causing incompatibility I try to do it. Good luck with your game!