How to Turn off/down/up login sound when Ubuntu Gnome startup

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http://ubuntuguide.net – This tutorial shows how to turn off gnome login sound or adjust the volume when Ubuntu startup. 1.To turn off login sound,go to System->Preferences->Startup Applications.In Startup Programs tab scroll down to find out “GNOME Login Sound” and uncheck it. In Ubuntu 10.04,go to System->Administration->Login Screen.There is an options says “Play login sound”,but this doesn’t work after I uncheck this (HowTos)