A display device that displays a selected pickup is provided in a volume control that adjusts the volume of a performance. The display device is formed by a light guiding body, and by two types of LED that emit light in different colors, for example, a green LED and a blue LED, and are packaged on a printed circuit board. The green LED is turned on when the front pickup on the neck side is selected, so that a display portion on the light guiding body is displayed in green. In contrast, the blue LED is turned on when the rear pickup on the bridge side is selected, so that the display portion is displayed in blue. When both pickups are selected, both LED are turned on so that the display portion is displayed in both green and blue or in a combination of these colors (i.e., in cyan).