How do I add sound support to Windows 7+ VMs on Xen?

I am using XenServer 6.2 using the prebuilt ISO's from citrix. I need to have a sound device installed in windows in order to get audio applications to work. How do I add a fake software only sound card in XenServer? On VMWare this is fairly trivial to do so I assume this is doable in Xen.

Looking for a configuration for Xen or other software I can install via yum to solve the problem.

Solutions I would like to avoid:
Adding physical hardware to the physical machine, doesn't scale.
Relying exclusively on Remote Desktop for sound.
VisionHammerAsked:
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Daniel McAllisterPresident, IT4SOHO, LLCCommented:
Hmmm... on my systems, I simply open the KVM (libvirtd) Virtual Machine Manager, select the virtual machine in question, and click ADD HARDWARE. Then I choose Sound, and pick the kind of sound I want to emulate. The fact that it doesn't track back to any actual sound hardware has never seemed to bother the system in the slightest.

Dan
IT4SOHO

PS: For what its worth, my VM systems are CentOS, not Citrix
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VisionHammerAuthor Commented:
This works when  the VM is a HVM.
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