can i use multiple airport express's as ap's and have only the one near my amp output my streaming music through the amp from anywhere on that network even if it is connecting to one of the other airport express ap's?
apple airport express-OTHER
can i use multiple airport express's as ap's
If by "ap's" you mean Wireless Access Points, then the answer is yes.
and have only the one near my amp output my streaming music through the amp from anywhere on that network
Yes.
even if it is connecting to one of the other airport express ap's?
It would matter how they are interconnected. If you are referring to a "roaming" or "extended" network, then again the answer is yes.
multiple airport express output to amp
