Welcome to Team Fortress 2. After nine years in development, hopefully it will have been worth the wait. To listen to a commentary node, put your crosshair over the floating commentary symbol and press your primary fire. To stop a commentary node, put your crosshair over the rotating node and press your primary fire again. Some commentary nodes may take control of the game in order to show something to you. In these cases, simply press your primary fire again to stop the commentary. In addition, your secondary fire will cycle you through all the commentary nodes in the level. Please let me know what you think after you have had a chance to play. I can be reached at gaben@valvesoftware.com, and my favorite class is the Spy. Thanks, and have fun!