Sets the size of a click of trim. Default is “Fine”.  Exponential means small steps near trim center becoming progressively larger as trim moves away from center. Other choices provide:

• Extra Fine – changes PWM signal to servo by ~ 0.9 uS (microsecond)
• Fine – changes PWM signal by 1 uS
• Medium – changes PWM signal by 4 uS
• Coarse – changes PWM signal by 8 uS