I have a MacBook late 2009, OSX, 10.9.1 and I have always used Facetime to talk with my son who owns a MacBook Pro. Only recently, I am having trouble because I can hear my own voice repeat back to me when I talk to him, but he doesn't hear it on his end, nor does his own voice echo back to him. Facetime was working fine before that. Now it is so annoying, I can hardly hear what I'm saying. The echo is so sensitive you can hear the slightest noise we make in the room echoing back pretty loudly. Is the problem with Facetime, my own mic or speakers or is it on my son's side, as in his speakers, etc. Anyone else have this problem or has resolved it? Also, I still hear the echo of my own voice when I tried using headphones on my end. I'm guessing that if my son used headphones, it might resolve the issue, but we like to talk to the whole family at the same time. I have tried adjusting my mic settings and also have made sure to click the box for reducing ambient noise. Nothing works. HELP!