Flaperon seems have bug

Hi,I use f4050WING ON my plane,the firmware is arduplane4.0.5.i try to set up flaperon,all things works OK,but I can’t set the slew rate and flap percentage,I just set the flap slew rate to 20%/s,but it don’t works, the flaperon only have two position,which can’t be changed,one position is from trim value to servo minimum,the other position is half of that.does any one know the reason of this.the servo of two aileron are connected to servo out 3 and 4.but the flap function is OK.the flaperon can’t be go down slowly.

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