I've noticed that recently (and rather suddenly) I am feeling tons of feedback from my mouthpiece. Just to be clear, by feedback I mean vibration. New vibration and loads of it. Tuckering me out quickly. No mouthpiece or horn changes. Practice routines about the same. Happens all the time now. Anyone experience this, if so what was the cause? the only thing I can guess is I'm not putting enough pressure on the mpc, but past that I'm clueless.