If you ask people what the soundhole is for on a guitar (or a Strumstick), most people will say, "to let the sound out". A search of the web will yield answers like: "letting the vibrations from the strings fall into the body" to " spreading the soundwaves" and "it acts like a speaker". All those answers, while technically incorrect, do dance around what people's experience suggests to them. You could say they are poetic answers. But what is really going on?