A synthesizer (also spelled synthesiser) is an electronic musical instrument that generates audio signals.Synthesizers generate audio through methods including subtractive synthesis, additive synthesis, and frequency modulation synthesis.
Austin, Kevin - Introduction to the Analog Synthesizer (1984 - 2017), Concordia University, Montreal, Canada; External links. 120 years of Electronic Music has information on classic modular synths. Synthmuseum.com Resource for vintage synthesizer information and images. Modular Analog Synthesizers Return! Article about new modular systems.