Hey I know it’s too late but I was searching for this exact answer so I’m going to necro this thread.
to my knowledge posted a good answer but one that didn’t work for this situation. HuntaKiller you need to go to your Project Settings → Collision and create a new trace channel for your bushes/foliage. Default should be ignore.
Now, in your foliage collision settings you can set it to overlap with that trace channel. You can then create an event on event tick or timer that linetraces from the player down to the ground and checks for that channel. If it returns true, then play a rustle sound. I also added a cooldown so that my player wouldn’t be spammed with that noise.
I hope this helps everyone because I spent a few hours trying to figure this out…