Usually, this is done while the attendants are able to score a shitload of different shit, for the purpose of the flute building you would indeed need at least twenty different substances to make it really interesting. To make it smart, you usually line up the shit from mellow to oh-my-god-this-is-strong, so you can play to flute from left to right and get increasing power going to your brain.
Louis : Don't pussy out on me right now bitch, let's roll a fuckin dutch pan flute and we'll get through this pile of happiness in a jiffy.
Chris : Man, you crazy !
Louis : Shut up and get some cardboard and paper.
Chris : Roger that.