I am a comeback player and the last four years I have really come back. Just when I think I have, it more stuff comes up. I had trouble double tonguing. After the fix I found that it wasn't really the tonguing, it was I am coming in late. I started to transpose. Now I have been playing the same literature on different trumpets and transposing. All of the sudden the intervals sound different. What trumpet is the wrong one? I used to play stuff on a different key instrument and not transpose. Now it sounds wrong and bugs me. Does the list ever end?