Synth pad
From The Art and Popular Culture Encyclopedia
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A synth pad is a sustained chord or tone generated by a synthesizer, often employed for background harmony and atmosphere in much the same fashion that a string section is often used in orchestral music and film scores. Typically, a synth pad is performed using whole notes, which are often tied over bar lines. A synth pad sometimes holds the same note while a lead voice sings or plays an entire musical phrase or section. Often, the sounds used for synth pads have a vaguely organ, string, or vocal timbre. During the late 1970s and 1980s, specialized string synthesizers were made that specialized in creating string sounds using the limited technology of the time. Much popular music in the 1980s employed synth pads, this being the time of polyphonic synthesizers, as did the then-new styles of smooth jazz and new-age music. One of many well-known songs from the era to incorporate a synth pad is "West End Girls" by the Pet Shop Boys, who were noted users of the technique.
The main feature of a synth pad is very long attack and decay time with extended sustains. In some instances pulse-width modulation (PWM) using a square wave oscillator can be added to create a "vibrating" sound.
