We use Pandora as one of our many music sources.
Pandora offers a box that you can control with your computer for business use.
Currently you would have to exit SambaPOS to get to the desktop to change things.
Would it be possible to have an entity screen where it has a html page inside or frame and go to the 192.168.x.x address locally for quick station changes?
Here is a screen shot of the controller page within the default chrome browser.