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On preamp voltage: An amplifier is exactly that. It takes its input signal, and, well, amplifies it. If it gets a stronger input signal, the output will obviously be greater. And if your preamp voltage is boosted, you can dial down the gains and get the same amount of output.
I like to think of it like this: The gain is a control of the balance between absolute power output, and the cleanliness of that power. The further down you turn the gain, the less power you'll get, but the cleaner that power will be.
Agreed (And we'll stop there)?
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