New here, and to Alexa. I have a whole home sound system with inputs in each room, but each room is a separate channel. I can hard wire an Echo to any one of the room's inputs. I'd like to be able to control a common music stream from either of two Echos located in different rooms. To do that I plan to connect each Echo to a common multi-source Bluetooth receiver, then hard wire the BT Rx output to one of the home's input channels. However, I cannot figure out if the two Echos will coordinate if I start a stream with one, then change the stream with the other? Has anyone tried to do this?