An analog (see WFTD archive Analog) synthesizer uses voltage controlled analog modules to synthesize sound. The concept of a variety of analog modules, all of which can interconnect via a standardized voltage control system, was invented by Dr. Robert Moog. The three main voltage controlled modules in an analog synthesizer are: Voltage Controlled Oscillator (VCO), Voltage Controlled Filter (VCF), and Voltage Controlled Amplifier (VCA). The oscillator (see WFTD archive Oscillator) generates a periodic waveform, the filter (see WFTD archive filter) is usually employed to remove certain frequencies from the waveform, and the amp is used to vary the attack and decay characteristics (see WFTD archive ADSR).
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