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I'm in a real predicament here. I have the entire trumpet together and I know for a fact that the valves are installed correctly but I can't get a clean sound from it. I press the different valves and have verified one at a time that the air is flowing through the valve and out the other side for all combinations of open and closed valves. I have put vaseline around the valves to seal up any air leaks but the sound didn't change. It sounds partially muffled and when pressing any valve the note does not change. I am at a loss. Any ideas? Did you have this problem?