If you cannot hear any sound, check that you are using Internet Explorer, that your speakers are on and that the volume level is set correctly in Windows.

Note: The first time this page is displayed, a dialog box may appear to ask your permission to install MacroMedia's Flashplayer. This software is needed to play the sounds on this web site. 

If you reply OK to the popup dialog box, the Flashplayer software is automatically downloaded from www.macromedia.com and installed on your machine.