I’l try to explane, (my englisch is not verry good)
In homey i have made a virtual button for each radio station. When i turn a virtual button on the a cast started to the chromecast which is connected to my marantz receiver. The inputs of al the buttons on the dashboard shows the state of te buttons in homey. So when a button is turned on in homey the collor gets green and when a button is set off the coller gets white. The output of the butten turns the virtual button in homey on en homey set the other buttons back to off.
This a print screen of some flows
The node red script of the stations:
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