Both TARS and Aries by default enable FWD for your left ear, AFT for your right ear, and MID for both ears. Given that both tools are designed with improved realism in mind I'd assume that's how the actual 10C radios work. However, I vaguely recall Snoopy mentioning something about that being incorrect but now I'm not sure anymore.
So, how does it work in the current suite 10C, and was it any different back in the suite 3.X test days?