sorry,

  y(n) = coef2 * (coef1 * x(n) - k * x(n-1))

with

  for (j=0; j < iord; j++)
      kfco = kfco * (1 + (sep * j))

  b = 10 / (kres * sqrt(kfco)) - 1
  k = 1000 / kfco

  coeff1 = b+2*k
  coeff2 = 1/(1+b+k)


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