From Fanatec:
"Force Interpolation “INT” (similar to the ‘Reconstruction Filter’ on OSW/SimuCube) filters and smoothens the incoming rough game FFB signal and increases the refresh rate. For example a 60Hz FFB signal (e.g. iRacing) looks like rough steps on a graph and can also feel like this, but using Force Interpolation, the signal is recreated as a smooth curve. In comparison to FEI, this filter is a lot more powerful as it doesn't influence latency as much, has a better smoothing algorithm and doesn't eliminate effects completely.
Some short tips for finding good settings INT:
- As low as possible and only as high as needed.
- Increase if you feel too much noise
- Decrease if you feel too less details
- Games with smooth FFB and high update rate you probably will have it at 1-3 or even OFF
- Games with rough FFB and low update rate you probably want it higher like 4-6 or even more"
From Fanatec:
"Natural Damper provides additional damping which can be adjusted from OFF to 100. 100 will have the strongest damping effect which reacts to the acceleration and angle of your steering. If turned OFF, your steering will have no additional damping, making it easier to turn the steering wheel. Natural Damper is useful for controlling the speed of the wheel during oversteer, and also helps to reduce wheel oscillation. Oscillation is typically caused by latency in the feedback loop, and is more apparent in racing games that are not optimised for high-torque motors. The default value of 50 provides a balance between steering responsiveness and oscillation mitigation."
An experienced person can drive with NDP off without any problems.
An inexperienced person should use NDP, but do not overdo it because details are lost.