How does a standalone sound system hook up with the microserver?
The simplest solution is sound over HDMI (ie your amp/receiver needs to have HDMI ports). AFAIK, the Microserver doesn't have onboard sound (other than PC speaker).
An alternative solution would would probably be to buy a suitable sound card (digital or optical out) and have your amp process the sound.
I think most people are using the former. Hope that helps.