[CentOS] KVM and Win7-64 Sound

Dear Gurus

I have been unable to make sound (and microphone) work in Windows 7 
(64-bit) as a VM with KVM.  Google searches reveal this to be a 
common problem, with various solutions recommended, primarily Ubuntu 
oriented, none of which have worked for me.  So I wonder if anyone 
has a working Windows sound condition with:

Centos 6.5 with KVM, all on a 64-bit Intel platform.
Sound works on the host machine, verified when I switch into GUI mode 
and run a sound-producing program

Sound does not work in the Windows 7 (64-bit) PRO installation as a 
Virtual Machine, and I have tried specifying the emulated hardware as 
AC97, and ICH6.

Any working examples?

David