I started playing the trumpet last September after a 35 years. A Conn 22b made in 1930, the horn sounded great my tone and range came back, everythings great. Five months ago I purchased a cornet on ebay that I am very happy with, it sounds great, it's fun to play. I have been playing the cornet and not the trumpet since the purchase. A few weeks ago I picked up my trumpet and now it sounds sour to me. I used to have great tone (too me) and now it's sour! I suspect that if I put the cornet down and exclusively play the trumpet I'll get good tone quality back. Anyone experience this?