Abstract: Levers are used on a multiple-stringed musical instrument to enable the player, while performing, to raise and lower the pitches of individual strings. Finger pressure upon the levers, by tightening or slackening individually selected strings, can be used to both raise and lower the pitches of strings from their rest tunings selectively, simultaneously, and independently of each other. This can be done while leaving other strings in their rest tunings. Increasing pressure on a rod results in increasing deviation from the rest tuning, either up or down in pitch, depending on the direction that the pressure is applied.