In an effort to help glynch6832 and others experiencing the same issue:
1. The Facetime audio problem has now been running unresolved for over 2 years (despite various changes in OS and over 95,000 posts on the issue)
2. The consensus of opinion is that this is a software issue with Facetime that Apple is (conciously?) choosing to ignore for unknown reasons. Many of us have trawled the ocean to find solutons, but the disheartening conclusion is that there is still no fix as yet.
3. People have been trying to resolve this directly with Apple tech support, but Apple either denies that there is a problem; claims to be unaware of it (sic); or suggests lengthy, time-consuming and costly visits to Apple stores that achieve nothing.
There was a very good article in MacWorld by Lex Friedman, one of their senior editors ("Can't trust this: Inconsistencies shake faith in Apple" - Nov 19th 2013), highlighting that this kind of unresolved issue with the fundamentals of the OS and functionality is eating into the confidence of users in Apple as a brand, particularly as competition is catching up and doing things better.
The aim at the moment is for sufficient people to make sufficient noise on this in the press to get Apple to fix it. The current approach of working through tech support, blogs or forums is not getting anything done.
If anyone can shed light on why Apple is in denial and deliberately choosing to stick their head in the sand over this problem it might help us all?