When developing a game the sounds is important for the user experience. When you’re still developing it’s cool to have some mock up sounds when testing so you get a good feeling about the experience. There is various tools to generate these and one very cool one is the sfxr made by Tomas Pettersson.
From the description: “Its original purpose was to provide a simple means of getting basic sound effects into a game for those people who were working hard to get their entries done within the 48 hours and didn’t have time to spend looking for suitable ways of doing this. The idea was that they could just hit a few buttons in this application and get some largely randomized effects that were custom in the sense that the user could accept/reject each proposed sound.”
There is also a version working directly from the web which could be usefull superflashbros.net/as3sfxr/