I have access to Aircraft using a GNS-430 as Primary radio connected to a KMA-20 Audio Panel. Radio transmits and receives perfectly with one exception. If the radio is actively receiving a transmission, the microphones of the pilot/co-pilot stop working. When the transmission stops, pilot and co-pilot can continue to communicate. Kind of annoying when mid conversation. Panel switches are configured as in attached photo. What could be the issue and can it be corrected with existing equipment. Hoping this is not normal and is just a simple flip of a switch.