"There are a number of technologies used for variable gain amplification, each having different advantages and disadvantages. Vacuum tubes are used in a configuration called 'variable-mu': the grid-to-cathode voltage changes to alter the gain. Also used is a voltage controlled amplifier (VCA), which has its gain reduced as the power of the input signal increases. Optical compressors use a light sensitive resistor (LDR) and a small lamp (LED or electroluminescent panel) to create changes in signal gain. This technique is believed by some to add smoother characteristics to the signal because the response times of the light and the resistor soften the attack and release. Other technologies used include field effect transistors and a diode bridge."
Um, yeah, ok.
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