While setting up my new laptop with applications, I noticed that GTK based applications (mainly Pidgin and XChat), that if you hit backspace in an empty text field, the system beep is triggered. (This is sounded regardless of your audio settings.) This can be easily fixed by editing the “.gtkrc” file that exists in ‘etc\gtk-2.0’ your GTK installation directory and also possibly in your home directory. Using a text editor capable of preserving UNIX file encodings, create/edit this file, and add the following line to the file:
gtk-error-bell = 0
You should now find that the beep no longer occurs after restarting the application and/or system.