This was my 4rd project. To control which room my Echo Dot Streams music to with just my Voice commands to Alexa.
By using a Logitech Harmony, OSD Audio Switch and Alexa, i am able to select which rooms hear the music streaming with my Echo Dot via voice commands.
If you want to look at the configuration presentation then you can use this link. Project 4 Config.
This project is a bit more dificult. If you are interested in what I did, just contact me.