module: leadlagfilter
parameters: double fz, double fp, double gain
inputs: double in
outputs:  double out
static_variables:
classes: Filter filt("1+1/(2*pi*fz)s","C3*s + C3/(2*pi*fp)*s^2","C3,fz,fp,Ts",1/gain,fz,fp,Ts);
init: 
out = 0.0;
code:
filt.inp(in);
out = filt.out;
