Online reviews say the Logitech HD Pro Webcam C910 works great on a Mac. I bought my C910 from Amazon which sells it as a Mac-compatible webcam. But the documentation that came with my unit says it designed for Windows only (no mention of Mac OS support). In fact, the C910 video functions well with Skype, but there is NO AUDIO in or out. My system is a Mac Pro 2x2.8GHz Quad-Core running OS 10.5.8. I have tried using USB ports on my 23" Cinema Display and on the tower itself. Fiddling with system prefs for audio I/O make no difference. I would love to know how to get this thing to work.