An electronic synthesizer is a device that produces ** sound electronically. They are often used to produce a variety of sound effects and melodies. Electronic synthesizers can produce sound through different methods, the most common being analog synthesis and digital synthesis.
1.Analog synthesizers: This type of synthesizer uses analog circuitry to produce and process sound. They produce primitive sound wave morphologies through oscillators, which are then altered by modules such as filters, amplifiers, and modulators.
2.Digital synthesizer: This type of synthesizer uses digital signal processing technology to produce sound. They can simulate the process of sound production through sampling (recording a digital copy of real sound) or through digital algorithms.
As for why some synthesizers have keyboards and others don't, it depends on what the synthesizer is designed for and how it is used
Synthesizers with keyboards: These synthesizers are usually self-contained instruments designed to play melodies and chords. The keyboard allows the player to play in a manner similar to that of a piano or electronic keyboard**. This synthesizer is perfect for a** and composers.
Synthesizers without keyboards: These synthesizers focus more on the production and modification of sound than on the traditional way of playing. They usually have knobs, slide faders, switches, and other control elements for fine-tuning sound parameters. This synthesizer is commonly used in sound design, electronic production, and experimentation. These synthesizers can be controlled by the user via an external device such as a MIDI keyboard, sequencer, or computer.
Overall, the synthesizer is an extremely diverse tool that can come in different forms depending on the needs and style of production.