Nope...it's not exponential it's logarithmic (based 10) Hence the Decibel scale. To save getting into that arguement..here is a clicky... http://www.phys.unsw.edu.au/~jw/dB.html
All the other stuff is based on personal experience. The bass guitarist knew full well he was overdriving the amp but "it sounds best that way and hey I'm a muso right?"
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sj