I have a small, and when I say small I mean small, problem. The noise that should play when my system is ready to log me in doesn't play. My guess is that the lightdm is not configured to use the correct audio out. When I log in all sound is fine. Is there somewhere I would be able to check the settings of the "Greeter" to see if it is using the correct output?

My system is Ubuntu 12.10 x64 using a USB Headset. Their is also built in sound on my motherboard and I think that is what lightdm is trying to use and I have nothing pluged into it to output sound, nor do I want sound being sent to it.