Calculates the median of the most recent length values, but only paying attention to values input while the trigger is greater than zero. One application of this is to calculate a running median of values coming from FFT analysis.
While trig<=0, the last-measured median is held constant.
The length argument is set at initialisation, and cannot be modulated. The length is directly reflected in the amount of real-time memory taken by this UGen, so please think carefully before using large values of length. Values in the low single- or double-figures are expected.
The median is implemented using a simple "selection sort", which is another argument against using large values for length since the performance is not tailored for large collections.