[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