Abstract: The volume control device temporarily alters the loudness of an electric musical instrument by allowing all (or part) of the audio signal to leak through a photosensitive resistor to ground. A light source is positioned so as to affect the value of the photosensitive resistor. The user indirectly controls the audio level by manipulating the light source in various ways: a control switch turns the light on and off; a selector switch determines whether the light source is normally off and turned on by the control switch, or vice versa; the brightness of the light source is adjusted by a variable resistor; and the time taken for the light to reach maximum brightness is controlled by an RC circuit. The device is removable and compatible with any electric instrument.

Abstract: The volume control device temporarily alters the loudness of an electric musical instrument by allowing all (or part) of the audio signal to leak through a photosensitive resistor to ground. A light source is positioned so as to affect the value of the photosensitive resistor. The user indirectly controls the audio level by manipulating the light source in various ways: a control switch turns the light on and off; a selector switch determines whether the light source is normally off and turned on by the control switch, or vice versa; the brightness of the light source is adjusted by a variable resistor; and the time taken for the light to reach maximum brightness is controlled by an RC circuit. The device is removable and compatible with any electric instrument.