Sound Entities in Level Editor

[AGP]

I successfully added one of the pre-exsisting Amnesia sounds files to my map and when I loaded the custom story story to the game, the sound played (as the player start area is right by where I placed the sound entity). I was wondering, is the entity activated when the player approaches it? I'm not quite sure what the controls in the level editor are/how they are used and was hoping someone might be willing to explain it. =)