Unfortunately audio (data) input via the rear DIN data input does not go out unless the mode selector is in the data position. In the plain USB mode only mic audio goes out. To recap, on 60M transmit only the factory programmed frequency slots are available and only via the memory function, and these pre-programmed slots can only be set to USB or CW. Has anyone done the "transmit on all frequencies mod" on the FT-450D by removing one of the soldered diode internal jumpers? This would likely work but would require great operator attention to avoid operating out of band.