[Espeefan]

The Sabertooth is nice because it allows you to run the dual motors one of two ways. In a mixed mode, where one channel controls forward and backward motion of both tracks together, and another channel handles steering, by slowing or speeding up the tracks to turn the model. The other option is true independent motor control, each with it's own channel, controlled independently of the other.

If I'm not mistaken, even in mix mode, you can still pirouette a model, just by moving the steering input, with no forward or reverse input. If there is no forward or reverse input, and you add steering, the tracks will go opposite directions, for turn in place pirouettes. As you increase the forward or reverse throttle, the pirouettes become travel in circles.