That's the way to do it! Both my wagons have this and it's so easy to use. Their outputs are switched with a PIE MPSS-4 source switcher. Simply put the empeg into standby and the switch restores power to the radio, allowing it to play. Press a button on the empeg, and the switch turns off the radio, sending empeg audio through the system. Now, I don't know how high quality the components of the switch are; both of mine have given me whine requiring extra grounding and filters. Maybe you can tame them! Good luck.