>One approach would be to "dither" the rounding by simply adding 1 or adding
>0 on alternate iterations.

I think that there is no way to make that low pass function span the
entire output domain. Because the math specifies an asymptotical approach
of the output value to the input value and asymptotes do not exist in the
integer math world. I also think that the fiddling with conditional
clauses will introduce points of discontinuity into the mapping function
and if this is a part of a servo or some control loop it may react
strangely to those points.

Peter

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