probably something like
Code:
myRobot.TankDrive(Stick1->GetRawAxis(2)*.5 , Stick2->GetRawAxis(2)*.5);
I'm not sure which axis is which for your controller (where the number 2 should be substituted with the Y axis of your controller for tank drive). I'm also not sure that you're using tank drive
Just multiply your joystick value by whatever you want to reduce the speed by, regardless of whether you're using arcade or tank or holonomic or whatever.