How to Stop audio from playing (Play Sound at Location)

Hi,

I’ve made audio that plays with trigger box entering an cave But it carry’s on Going outside of the cave how can i stop the sound when i go back out of the cave? I also have got ReTriggerable Delay So it can re-play entering the cave.
I tried Destroy Actor but it don’t Play the Sound at all when entering the cave/trigger box.

Also is there a way to Fade the Sound in when entering the cave and then Fading out going out of the cave?

Thanks,
TSDREX.