Yes for pure left (motor A speed is zero and motor B speed is high) other than pure left this one gradually increases means motor A speed start to increase from zero to high when i move my joystick towards middle upwards directions; Conditions (MOTOR B Speed > MOTOR A SPEED) and this one should also apply for pure right directions same as for left but Conditions (MOTOR A Speed > MOTOR B SPEED)..
Please see this graph as well
