Dear Jon,
you can use the AmplitudeResponse() and the PhaseResponse() functions to calculate the frequency response corresponding to a set of filter coefficients. E.g. magnitude of Simpson Integral filter:
Dim filterCoef = List("b", {1/3, 4/3, 1/3}, "a", {1, 0, -1})
AmplitudeResponse(filterCoef)
See attachment for the visualisation in a diagram.
