Selectivity Window is a plot with frequency in logarithmic scale in x-direction (horizontal) and sound amplitude in y-direction (vertical). It graphically represents sensor's parameters. Central vertical line denotes resonance frequency of sensor, two others represent resonance frequency of neighbor sensors.
Each sensor has two control parameters - Selectivity and Sharpness, they are depicted by yellow and blue lines respectively. Selectivity defines sensor output level in reply to signal with frequency different from sensor's resonance frequency. Sharpness defines peak form to be considered as note. If peak form is out of this range, it will not be taken for note.
Tuning up Selectivity Window