My F-150 has Sync with MyFord (not MyFord Touch). When I bought the truck, I paired the phone with MyFord via Bluetooth so the truck would automatically connect with the phone each time I start the truck.
I start the Scanner Radio app and select which feed I want. Once the phone says the feed is streaming, I give MyFord the voice command "Bluetooth Audio." MyFord automatically starts pulling audio over the Bluetooth connection into the stereo system; the only thing left to do is adjust the volume levels on the phone and the instrument panel. It works really well!