dixie above has mentioned he has setup a similar setup
http://forum.dsmg600.info/viewtopic.php?id=4440
Looks to me the functionality that is being talked about. I presume dixie you are Kai from the other forum? Or have just followed the instructions?
Anyway, it was using mpd, raop-play and an mpd iphone remote app. No firefly.
Pretty cool. I need to scrape up some funds for an apple express and nas now!