Bought a used Alto and love the sound I get but was having difficulty with anything below low D. It sounded like I had a leak. Had the tech drop a light and we could not find a leak. He replaced the usual suspect pads and thought they were not seating and tried other adjustments but it still sounded like a leak. Then he remembered that years ago he had the same problem with one of own horns and another player told him to crumple up a little paper and drop it in the bell. He did and now the horn plays those low notes a lot better but still there is a little of the modulation. Anybody ever hear of such a ting?