In 1,3 you have 2 swoops.
One you start with a doubletap. And than use single taps to chain the swoop.
Two you start charging your turbo, press a direction and stop charging it. And youll also burst into speed. Chains are also made by just pressing the direction.
On a side note. Im kinda wondering how much people are bashing the buttons in. Not once were my fingers messed up after playing this game. Even if i played it for several hours straight.