I'm wondering if there's another way that one could reproduce this effect all of the time without using our hands, like creating something that would stick to the end of the mouthpiece and influence the drag in the same fashion. Any thoughts?
I just tried it with a cocktail straw in my mouth, that works. Hold it next to your pv, or tape it there if you really like it lol! I think a regular straw might be too big but I don't have one to try it with.