Jody brings up a damn good point. My idea is right, but I may want to reverse a couple things. Let's crossover, but crossout the sound effects going into the headset. Let's then have the external crossed just to allow the lower frequencies, that way you get the rumble of the engine, the thump of the runway and a few external sounds. Really, what one wants is to filter those external sounds out of the headset but leave the other ques there.
I wonder, I know bitching betty probably comes through the headset, but does the RWR and heater tones do as well?
Jay