on the hum part…two things it looks for 1. a steady blow…dont start blowing too hard, then lower the amount towards the end. keep it steady, doesn’t have to be a strong blow, just medimum and steady with some type of noise will work. I mess with mine and do all sorts of blows to see what will work and wont, but it seems to like me because usually i get a pass, some aborts for no reason, but their no big deal.