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One of the core concepts of a modular synthesizer is that one module can control another’s actions. Since a module can’t (yet) reach over and twist a knob on its neighbor, it does this through the idea of voltage control: a voltage level you send to a module adjusts one or more of its parameters. The clearest case of this is pitch: the voltage level you send to the to an oscillator determines what pitch it plays. The more voltage controllable parameters a module has, the more you can animate its sound by connecting it to controllers and other modules that output varying voltages.

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