No Sound on VM of Snow Leopard

Hello,

I'm using Fusion 6 for Mac to virtualise Snow Leopard on my MacBook Pro to run some PPC applications which are no longer compatible with Post-Lion Updates. I was able to successfully install OS X Snow Leopard Server, however the sound card doesn't seem to be recognised by the VM. I configured it correctly in settings (making sure the card is turned on) and it works on my regular desktop, but when I go into the VM it doesn't even appear on the Output in System Settings.

Could someone help me out please?

Thanks in advance

Leon