I just set up my AppleTV and I have a quick question. Before I got the AppleTV I had two APXs and my iMac to stream music throughout my house. Now that I have the AppleTV I took one of the APXs out. Is it possible to link my iMac, AppleTV, and APX together? It seems like whenever I try to link all three together I am getting an error message within itunes. Any help? Thanks.