Synthesizer (MusicalSynthesizer) is used to generate and modify sinusoidal waveforms and superimpose them, and then emit specific sounds through the sound generator and speakers. The synthesis of overtones determines the sound quality. A synthesizer is a variety of box-type devices connected to each other, and finally connected to a keyboard. When you press a keyboard, a unit containing an oscillator will make a sound, and some other box devices, a filter, will control the tone of the sound. An amplifier will control the volume and so on.
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