Selectivity Window consists of two curves, each controlled by it's own slider. Yellow one denotes resonance curve and is controlled by selectivity parameter. Blue curve is controlled by sharpness.
When adjusting these two parameters you need to take into account the musical instrument used in performance. When instrument has crisp sound with certain pitch value (piano, guitar and so on) both Selectivity and Sharpness might be decreased to avoid passing waste notes. In opposite case, when melody to recognize is played with, say, Pan flute (this instrument has more distributed sound), Sharpness needs to be increased in order to recognize at least one note.
Best way to check the correctness of parameter adjustment is to estimate amount of notes per second produced by the program. In most cases you will have two or three simultaneously sounding notes if using polyphonic algorithm, and as many consequent notes per second if using monophonic algorithm. Try to estimate the amount of notes in initial melody and set a little bit more notes produced by recognition algorithm.
Note, that Mono Correlator recognition algorithm does not use sensors, so Selectivity Window is disabled when choosing this method.
Related topics:
Choosing Recognition Algorithm
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