I think of it as acting like a gate that controls the flow of a huuuuge stream.
Say you’ve got this tiny signal… a faint whisper. Electronically, you can detect the signal, but it is very small. If you connect the rise-and-fall of that signal to the rise-and-fall of a gate… then the small signal is converted into a signal that is equivalent to the size of the stream that is behind the gate.
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