You may have noticed a feature in the Settings Menus on the Firehawk/Amplifi Remote app called Advanced Routing. This feature helps manage having multiple Firehawk/Amplifi devices when connected, so you could Airplay music to another Bluetooth device while still controlling tones on a particular device. It would allow you to airplay the music stream to something other than the Firehawk/Amplifi, while still controlling tones on the unit.
If you pair two Firehawk/Amplifi to a single mobile device, you should see some additional options as well.