Capacitors are energy-storage devices that filter the high frequencies. A cap lets the tone control roll off the treble response, progressively warming the tone. The higher the value, the more bass output from the tone control at its "zero" setting.
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A cap wired to a potentiometer creates a standard tone control.
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Value Code Common use
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180pF 181 PRS Treble bleed
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.001uF 102 Common Treble bleed
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.022uF 223 Humbucker tone
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.047uF 473 Single-coil guitars, many basses
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.100uF 104 Basses and certain eras of vintage Fender guitars
