The days of controlling your whole house audio from a volume control on the wall are in the past.  There is a smarter and easier way,  "Alexa, turn on my house music".  Immediately your favorite Pandora station kicks on everywhere you want it to play. Governing the different volume levels, song changes and sources use to be complex.  Now, all that's needed is to reach in your pocket and seamlessly make any adjustments to your whole house audio from a slick app on your phone or tablet.