Hi again...

I looked at the MX-3 manual online and it seemed to only have one number, not both point and rate... I then called Airtronics tech support to be sure, and they told me the MX-3 doesn't have both settings, the setting is for the rate, not the point. So, by changing the value, you're changing the initial response rate to the wheel or trigger movement, not the point in the wheel or trigger movement where the change occurs. So, for a softer initial steeriing response, you'd set the number to a negative value, the bigger the negative value, the softer the initial response. When you get to around the mid point of the steering wheel movement, you should notice the response rate increase. For the throtle, you said you want a sharper initial response, so you'd set that to a positive value. The higher the value, the sharper the initial response, then at around half trigger the response drops off to normal for the rest of the way. The ARC value you specify for steering applies to both left and right turns equally, for throttle it only applies to the throttle side of the trigger pull... the brake side remains linear. The brake endpoint will serve to get the braking feel you want, but if we're talking an electric car, you want to set the endpoints to full (or whatever the speed control manufacturer specifies) and calibrate the speed control to the transmitter BEFORE changing the brake endpoint to suit your driving style or preferred feel... if you change the endpoint before calibrating the speed control, the speed control will calibrate itself to give full braking at whatever endpoint it "sees" during the calibration...

Hope that helped...