Alexa playback is fully enabled. Simply say:

"Alexa, Southern Sound"

or "Alexa, Play Southern Sound"

(for iOS, Android or MacOS)  

Then you can say, "Hey SIRI, play Southern Sound on myTuner" OR

 "Hey Google, play  play Southern Sound on myTuner."

(for Samsung TV,  LG TV, Android TV, Roku Player and Apple TV)

Use your TV or media device to add the myTuner Player and then search for Southern Sound Hospital Radio in the myTuner app.