1) I have an issue where my lips literally stop vibrating, sometimes right in the middle of a simple scale passage. I make sure they're moist, I make sure my horn is oiled up so no valve funkiness, no excessive mouthpiece pressure and good breath support (like it happens even right after I start playing). I realize this might be a "teacher must see" situation, but I thought I'd ask. It's just very odd and it really hinders upping the tempo on various exercises. Any ideas? 2) Is it ok to anchor my tongue between my lower teeth and lower lip when tonguing, and making the tu motion with the middle of my tongue against the roof of my mouth (that ridgey part)? No matter how hard I try to say the syllables tu - tu with tongue between upper lip and teeth I can't do it. It's like my tongue's too big. Thoughts?