So... when I used to carry my Provari/Carto-tank setup everywhere with me, my friends (namely my cousin) would tease me and say it's my "magic flute." Now with my REO and RM2, I've drilled out the air hole to 1/16" and have the luxury of "throttling" the air. While it's not a tube mod granted, I like to "play" the air hole like a flute. "Doo da doo doo doo"... ((exhales clouds))...