Pretty much only functional with turbo mode Every x position, it iterates the value '0.5' through the function n=n*r*(1-n), where 'r' is determined by the x position. (r=1 on the left side of the screen, r=4 on the right) After skipping a few iterations, it draws a point every iteration at a height proportional to n (n=0 at the bottom, n=1 at the top)
