Dub siren
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A dub siren is a type of synthesizer used predominantly in dub music. It is usually a relatively simple oscillator, housed in a box, often allowing for a variety of waveforms to be altered by turning potentiometers controlling pitch, rate and other parameters. Dub sirens are frequently activated by a button, sometimes able to be toggled between continuous synthesis with one button press, or sound emission only when the button is held.[1]