audio signal sampled data processing

How do I do operations on audio signal sampled data? For ex. I want to double the amplitude of audio data(multiply the data by 2)

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Double to relative amplitude? Or double the pressure?
double the pressure
The back of my memory is saying that pressure is proportional to amplitude squared; if so then multiply by sqrt(2). I could easily be wrong on the relationship.

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2013-11-17

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