Cracking stuff. Many thanks.
Might be worth buying myself a christmas present.....
But it's not the answer I was looking for, I suspect because I probably asked the wrong question (no change there).
What I really wanted to ask was whether an echo/dot would appear as a DLNA(?) device on my network to which I could send music from MC, either directly or via JRemote. So at the moment I have 2 av receivers, a TV, and an internet radio to which I send music from JRemote. Would an Echo or dot appear or work in the same way.
Putting it all together, in the demo video for House Band, I suppose the ultimate solution is to be able to ask Alexa to play a choice of music on itself rather than on the device running MC. Almost certainly the wrong termoniology but does that make sense? So I could sit in my floating armchair like a passenger from Wall-E and say "Alexa play my ambient playlist in the lounge" ;-)