Glad it works now! A majority of Parameter commands can be found on the wiki: A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums
Unfortunately I haven’t had time to update it in a bit, so callbacks aren’t in the wiki but they do work in the parser. With the “Simple” node you can set an object as the loop target then use “loopfunction” or “olfn” (short for “on loop function name”) then specify the function name. For example “olfn = MyFunction;” or “loopfunction = MyFunction;”. I’ll add these to the wiki when I remember 
This will call your function every time a loop section completes so for your situation it should sound every time it changes direction without having to do anything extra.