I'm using a Logitech Quickcam Fusion (ID 046d:08ca) webcam for Skype, and the test call in Skype plays back a loud clicking noise every two seconds consistently. The problem doesn't appear to come from the webcam, because the same clicking noise registers when I try to record something with a separate external mic outside of Skype. I'm still using ubuntu 9.10, and the threads I've read about users having problems with mics and audio in 10.04 have made me reluctant to upgrade. I have an HP Pavilion Slimline, AMD64. Does anyone know what this clicking noise is, and how to get rid of it?