A tip for anyone out there, have your instrument inspected by a professional every now and then. Trumpets are so varied, and once you get used to one it's hard to tell there is anything wrong. Handing your instrument to a teacher can help diagnose any leaks, inconsistencies, or manufacturing issues with your trumpet. There is a 99% chance it's you who is making the horn sound bad, but a 1% chance it's your equipment.