Well, unfortunately, Airfoil only works for single broadcast. My guess is the problem lies with AirPort itself, because it can only send/receive unisignally. I don't know this for a fact, but it seems probable. Otherwise multiple broadcast would have been incorporated into iTunes a while ago. And pardon the ignorance, but I'm not sure what you're referring to by "netcasing." But anyway, if the problem is what I think it is, then perhaps it would be possible to broadcast to multiple Expresses if you had multiple wireless cards in your compy. If that's the case, then maybe I can mod my dad's comp to accomidate.