One speaker on MacBook Pro not working for certain programs?

When I either receive or place a FaceTime call on my MacBook Pro, the left speaker cuts out audio and produces high static. The right speaker is fine. The receiving end can also hear the static feedback, but their two speakers work fine. I have all my iOS devices setup to receive and place FaceTime calls (iPhone 5s, iPad, and MacBook Pro 15 inch late 2011). If I place or receive the FaceTime calls on my iPhone or iPad, there is no problem.
I've tested the speakers, youtube, iTunes audio, streaming websites, netflix, etc... and all works fine on the MacBook Pro. Just FaceTime. I also went into system preferences and the speaker setup is correct (audio in and out - internal speakers).
I've also restarted, reinstalled Yosemite...still FaceTime left speaker problem.
I appreciate any troubleshooting advice and/or if others have experienced this problem.
Thanks!

The Troubleshooting FaceTime for Mac OS X:FaceTime for Mac: Troubleshooting FaceTime - Apple Support does not offer much in the way of help for the problem you are having.
Have you tried going to System Preferences, Sound, Output and playing around with the Balance to see if that makes any difference?
You might also consider going to FaceTime, Preferences and turn FaceTime OFF and then back ON.
And to have the system checked, you could take it to an Apple store genius bar and have the techs see if there is something hardware-wise interfering with FaceTime.

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One speaker on MacBook Pro not working for certain programs?

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