I wash my mouthpiece every day after practice, and clean my horn every 2 or 3 weeks. It's also not an equipment problem because I've sounded like this on multiple different horns and mouthpieces. My valves are fine, a little sticky but always placed properly. Again, I can assure everyone this is not an equipment problem. Is the tongue position an easy fix? I can try it later today. What specific effects would it have on tone?