Cool thing just happened. I was grilling outside and practicing my breathing. The air temperature where I live is cold enough to see the breath. I grabbed the visualizer, mouthpiece, and lead pipe, and I took them outside. It was good to actually see the breath besides the tissue’s indirect motion. I can see that I really did need to move the mouthpiece down. Also, with nice sounding higher tones in the lead pipe, I could see less air coming out of the pipe. With Valdalva and straining, there was even less air. Try it if it’s cold enough outside, or maybe it can work inside with a freezer door open.