I in version 11.0 PPC (gnome), there used to be a sound that would come on briefly at the time the panel window appears in the startup sequence. At some point, after doing a software update, the sound stopped coming on. Is there a way to get it back; I liked that sound.
I’m very surprised that you actually like these sounds – one of the first things I do when I install a new version of the system is to disable all operating system sounds.
No offense, rjwilmsi, but that is probably not the answer foxmg was looking for. 
What desktop are you using? In KDE 3.5, the sounds are controlled in kcontrol, under Sound & Multimedia → System Notifications. In KDE 4, it’s in systemsettings, under Notifications → System Notifications. If your using GNOME, you aren’t worth my time…
just kidding.
I assume that in GNOME they are in the control center but I am not certain.