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Synthesizer as used in music, is a term derived from a Greek word syntithenai (synthesis) and is being used to describe a device capable of generating and/or manipulating electronic signals for use in music creation, recording and performance. A synthesizer is capable of generating and manipulating audio tones such as musical notes. Synthesizers can create electrical signals needed to drive and play audio amplifiers. The tone is generated by electrical circuits which may have adjustable parameters (as in analog synthesizers), and can perform mathematical manipulation of signal using a microprocessor and digital signal processing (as in digital synthesizers), or by a combination of both methods. Synthesized sounds may sometimes contrast with recordings of natural sounds , though sampling synthesizers significantly blur this distinction.