A day after updating to Yosemite on late-2011 MBP I answered a call from my IP6 and was impressed by how well it worked and sounded. Then a few days later (after using headphones) any incoming/outgoing FaceTime audio calls has static/popping/crackling on the right side speaker on the Mac. I have been able to temporarily fix it by (in Terminal): sudo killall coreaudiod However when you use headphones after this the audio issue returns. I did submit a feedback report to Apple (on the Apple discussions someone said Apple is aware of the issue). Just wanted to share for those who may encounter this.