I wanted to thank all you guys that helped me troubleshoot my bad out of tune " buzzing " 2nd valve ( and combinations using 2nd ). I feel that I now know more than I'll ever want to know about trumpet tubing. After micro inspecting related sound ( air ) paths for leaks as well as the valve itself. I even injected the areas with some steam to clean it out. The problem was the stupid main tuning water key cork. The cork was worn down and not completely covering its' opening. Why it didn't have the awful sound with open, first, or third is somewhat of a mystery to me anyway. I took off both water keys and played it with my fingers over the holes. It sounds great ! Rubber impregnated corks were ordered yesterday.