Improve screamer analysis

[bushig]

Don't use constant probability like 0, 0.50, 0.75, 1, but use dynamic scale like from null(no sound), to 1.0(100% sure its screamer). Read more on sound theory.

[bushig]

https://en.wikipedia.org/wiki/Sound_pressure
https://en.wikipedia.org/wiki/Equal-loudness_contour
https://en.wikipedia.org/wiki/Threshold_of_pain
https://en.wikipedia.org/wiki/A-weighting