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A sound synthesizer (often abbreviated as synthesizer or synth, also spelled synthesiser) is an electronic musical instrument that generates electric signals (waveforms) which can be converted to sound through loudspeakers or headphones. Synthesizers may either imitate other instruments or generate new timbres. They can be played (controlled) via a variety of different input devices, including keyboards, music sequencers and instrument controllers. Synthesizers use various methods to generate signal. 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. Other sound synthesis methods including subharmonic synthesis used on mixture trautonium, granular synthesis resulting Soundscape or Cloud, are rarely used.