Okay, now that I see what RoadRunner is and what it does, I would then ask:

Why?

Its purpose is to be a media playing front end for an in-car computer. In that situation, you already have a PC full of MP3s in your car. Why confuse the issue by adding an empeg to the mix, when you can already do everything you need to do from RoadRunner?

I mean, I'm sure the empeg is better at the job of indexing and playing MP3s than RoadRunner is, but at that point, just install an empeg instead of a car PC with RoadRunner.