Using a TAN takes practice, and it takes instructors to train younger students (sometimes older ones, haha) on how to use it. Nothing beats playing with a tuner, both high and low, figuring out when you should use the thing. It seems hornlines tune one note, forgetting about some of the other valve combinations. The only thing though is that on my Kanstul, it sits all the way in, so it's not alot of help if I'm flat, but as long as I tune before I play and adjust the main tuning slide, it is not an issue. Ok, I am done on this subject.