Getting audio to work with a VM

Hardware: Dell 2950 with no soundcard installed (but open pci-e slots)
OS: RHEL 6.4
VM: Windows Server 2008R2

I assumed, based on my reading of the docs, that I don't need actual hardware to make some real noise inside a VM or am I wrong?

From the RHEL 6.4 docs:

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Emulated sound devices
Red Hat Enterprise Linux 6.1 and above provides an emulated (Intel) HDA sound device, intel-hda. This device is supported on the following guest operating systems:

    Red Hat Enterprise Linux 6, for i386 and x86_64 architectures
    Red Hat Enterprise Linux 5, for i386 and x86_64 architectures
    Red Hat Enterprise Linux 4, for i386 and x86_64 architectures
    Windows 7, for i386 and x86_64 architectures
    Windows 2008 R2, for the x86_64 architecture 

The following two emulated sound devices are also available, but are not recommended due to compatibility issues with certain guest operating systems:

    ac97, an emulated Intel 82801AA AC97 Audio compatible sound card
    es1370, an emulated ENSONIQ AudioPCI ES1370 sound card 

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Can someone point me in the right direction to get working audio out of my Windows 2008R2 VM? Do I need to install a soundcard in the VM host or can this all be done with emulated hardware?

Any help is greatly appreciated.