I have a multi room wired audio system throughout our home.  In the room with all the components, there is a single input jack that I intend to plug into an echo dot when it is delivered. All my music is on iTunes and I need to know how to utilize the songs I have via the dot.  I read somewhere that amazon music app can use iTunes songs.   
  
Also if my dot in the components room can't hear me in the living room, can I just get a second dot to interface with the first one?   Thanks!