that all depends on whether you are trying to do a positive or negative snap. The stick inputs for a snap are the same in knife edge as they are in level flight. If you roll right and are holding left rudder and you want to go positive-right-snap then you go up elevator, right aileron, right rudder then opposite rudder as you come around back to knife edge. If you want to do a negative-right-snap then you go right aileron, more left rudder, and down elevator then back off the rudder. a snap is a snap. positive require up elevator and same direction rudder and aileron. Negatives require down elevator and opposite aileron and rudder.