Hey Thom, be sure to watch the early videos over and over and over. Eventually the note will speak naturally. Your lip oscillation isn’t yet 100% sympathetic, it is taking time to respond to the change in air pressure, that’s OK, stick with it. I suggest lots of visualise (or finger), tissue, mouthpiece (no buzz) then add leadpipe practise and simply keep doing the correct PROCESS, don’t manipulate it. Cheers, Greg