Is anyone else experiencing static noise from the Mac Pro line out? I hear what I can best describe as random white noise which I can hear even if I turn the volume all the way down. If I say scroll up or down in a browser window, hold down a key (to repeat) or even just type I get additional noise. It stops when I stop scrolling or typing. Why is this happening and what can I do about it? I'm on a Mac Pro 5.1 (2010) with OSX 10.6.8. PS: I remember having a similar problem with a Powerbook where strangely using "TextEdit" generated a lot of random digital noise out of the speaker!