re: whats your frequency of your t: Based on the one of frequency tester I landed on around 12,500 on their scale. I then removed that frequency from the sound track.
re: listing to them outside. Thats the best part for me. It seems my mind believe the T sound is part of the external sound. Perfect blend even at low volume. I even have to keep it on when watching TV. Even pound audio from the TV doesn't mask the sound. I'll try uploading the file to this post.