Play around with the numbers, and see what you can get. Post cool combinations in a comment!
S key shows four sliders that you can play with. H key hides them. C key clears the stage. R key sets the variables to random values. P key lets you manually program values to the variables. (Enter an invalid value or just press 'enter' to leave the value unchanged.) (You can also use decimals! Try changing the first value to 2.5 and leaving the other ones at the default in turbo mode.)
