Definition: Gain is a complex issue; gain is usually expressed in decibels, and is the level between the input level of a device (an instrument, microphone, or audio signal) to a mixer, recording input, or amplifier, and the output of that device into a speaker, recording mix, or other output. This difference between input and output powers is generally thought to begin at "0" (unity gain), and can go into negative numbers as well as positive numbers.
Gain
By Joe Shambro, About.com
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