Analog synthesizers also use low-pass filters and high-pass filters to modify the sound. After the 1960s, analog synthesizers were built using operational amplifier (op-amp) integrated circuits, and used potentiometers (pots, or variable resistors) to adjust the sound parameters. The earliest analog synthesizers in the 1920s and 1930s, such as the Trautonium, were built with a variety of vacuum-tube (thermionic valve) and electro-mechanical technologies. - a synthesizer that uses analog circuits and analog signals to generate sound electronically.Among the most popular waveform synthesis techniques are subtractive synthesis, additive synthesis, wavetable synthesis, frequency modulation synthesis, phase distortion synthesis, physical modeling synthesis and sample-based synthesis. Synthesizers use various methods to generate electronic signals (sounds). Synthesizers without built-in controllers are often called sound modules, and are controlled via USB, MIDI or CV/gate using a controller device, often a MIDI keyboard or other controller. They are often played with a musical keyboard, but they can be controlled via a variety of other devices, including music sequencers, instrument controllers, fingerboards, guitar synthesizers, wind controllers, and electronic drums. Synthesizers may imitate traditional musical instruments such as piano, flute, vocals, or natural sounds such as ocean waves or generate novel electronic timbres. - often abbreviated as synth, is an electronic musical instrument that generates audio signals that may be converted to sound.
See also Softsynths, Sampling, Audio#Synthesis (for speech synthesis), Audio (in general), Groovebox, etc.
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