I do not know if the subject has already been treated.
I buy a 2X5 sabertooth I configure like this: http://www.ez-robot.com/Tutorials/Help.aspx?id=173
I control my motors with a joystick gamepad with the joystick panel, it works.
The problem is that it is all or nothing: the motors run in full speed or not run.
I will wish that I push the joystick a little, the engines run slowly and more quickly when I push the joystick away.
A kind of analog response in fact.
Does anyone have an idea of ??configuration?