Good. The second thing we need is something for the sound to come out to us: What we need is a loudspeaker. You already have speakers connected to you computer? That's good, but I don't mean a real speaker. Everything we do here is completely virtual! So we also need a virtual speaker (in addition to your real one). So let's get one. You find it in your Modules menu, submenu Output. It's name is real-audio. Just select it and find a nice place for it on your canvas.