Many thanks to Chris Freitas, who informed me that the excellent Global Tuners website, has produced an app for Android-based smart phones. With this app and a free Global Tuners account, your smart phone can remotely control a number of receivers across the globe.
Best of all? It’s free!
You won’t find the app through categorical searches via your phone–you must search for the term “Global Tuners” in the Google Play. Indeed, this app has been available since 2012, but none of my categorical searches had ever unearthed it.
To my knowledge, there is no Global Tuners app for iPhones/iPads as of yet (iOS).