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Applies a simple low pass filter to the current selection. A low pass filter lets frequencies below a border frequency pass and filters out frequencies that are above the border frequency.
The filter has grade two and is implemented as described in the book "The manifold joys of conformal mapping, applications to digital filtering in the studio by(JAES, Vol. 31, No. 11, 1983 November).
The border frequency of the low pass filter in Hz.