Several times, I got confused when I hear the T sound, and someone else says they hear the same, and oh, it's coming from that TV or that external device, etc. So apparently, there are quite a lot of external sounds that sounds an exact copy of my T. It's just that ever since having the T, I can't tell if it's coming off my head or external, or from both. Whereas for the other people around me, they could straightaway pinpoint where it comes from - and when they walk away, the noise cease from their hearing of course. This external sound, when it sounds like the T inside my head, didn't cancel out my T at all. And if it's not cancelling out, I'd rather walk away from the external noise.. if only I know it's external! Even though I can't tell the difference if it's from off my head, yet it's better not to be so exposed. In fact, it may just be being exposed to this external pitch that got me this form of T in the first place. This one refused to even get cancelled i.e no residual habituation. Confounding!