What DR1 is talking about is a throttle curve. It should be some sort of a mix in your menu (if available) that allows for you so set the throttle stick so that more stick moves = more/less throttle movement in certain places. Its a little different than a PMix as it has about 5 points that you set at different percentages of 100. The closer 2 numbers are together the more sensitive and responsive the throttle will be there. The further apart, the less responsive. On a 5 point curve you would set it up at something like 0-25-50-75-100 if you just wanted normal throttle response. Anywhere you move the numbers from there is going to alter the throttles response to the stick movement in that part of the range of the stick.