TA22305 Audio balance jumps to hard left on reducing volume

I have this exact problem on decreasing volume via the keyboard on OS X 10.8.4 on a MacBook Pro Retina with a Cinema Display attached.
Anyone know any solutions?
Thanks,
Stephen

Reset PRAM.  http://support.apple.com/kb/PH4405
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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