Yeah, I know this looks like a silly question. "Practice"is probably what most would answer. I'm comparing one horn against another. I have this Pan American alto with a new total OH and it's "stuffy". I put the same mpc. on my '29 Conn "Chu" and the sound just comes out, no resistance. No, I didn't leave the cleaning rag in the bell. I've tried several different pieces, always comparing...same conclusion. Is there any thing that can be done to improve the Pan Am? Would a different neck help? Or is it time to paint it and hang it up on the wall? (the lacquer finish is quite worn). Any suggestions?