[supergadgetman]

ok, I just tried something. I plugged a cassette tape adaptor into my TP2 and then put the adaptor into a tape player. I made another call and the other person was able able to hear me fine. I didnt sound muffled. I also asked if they heard an echo or feedback since I was listening to them through some loud speakers and they said no. The only thing I can think is plugging headphones into the TP2 activates the dual noise cancelling mics. Thats the only way I can see the other party not hearing themselves coming through the loudspeakers on my tape player. I'll be curious to know for a fact though.