Physics
The ordinary and maximum tolerance limit of sound by human being is

70 db to 85 db (decibel)
65 db to 75 db (decibel)
60 db to 80 db (decibel)
50 db to 70 db (decibel)

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Physics
Analog synthesis refers to a technology based on

Representing data in terms of measurable physical quantities.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Representing physical quantities as numbers.
Interfacing synthesizer equipment.

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