Anybody know if the Val com 760 radio is capable of transmitting through the Flight com 403 intercom with just 2 sets of head phone jacks. I've went through both manuals on the wiring and it appears to be correct, (short of taking Pin connector apart on back of flight com plug to verify wires inside it). But my 1994 is set up with 3 sets of dual plugs and the radio only works through the 1 set and the flight com through the other 2, doesn't matter what position the isolate switch is in on the flight com. So have to jump my plugs back and forth if I have a passenger. Is this system just to old or am i missing something?