I think the empeg might well struggle to run SqueezeCenter well. Some of the low spec Linux NAS boxes don't cope with it well.

The easiest way to get access to the music on the empeg might be via iTunes. Wasn't there an app for the empeg that would make music available to iTunes ? If so the SqueezeCenter iTunes functionality might well be able to access it.

Edit: a UPNP implementation for the empeg would achieve the same result I think, no idea how involved that it