Hi. I have had one dot set up for several weeks but would like to add a second so that I can hear my music in stereo. So far, I have not been able to find a YouTube video explaining how to do this when one of the dots is already set up for regular use. Can anyone direct me to a full set of instructions regarding how to do this? Also, I am playing my music using music in my own iTunes library . . . not from a subscription music service. Instead, I am using "My Media for Alexa" to send my own music to the speakers. Has anyone had any success using "My Media" to play stereo through two Echos?