An accessory for changing the timbre of a stringed instrument is provided, comprising a body having a vertical opening and a horizontal slot formed in the bottom surface from one edge into the vertical opening; an adjustment rod within the horizontal slot; and a dampener within the vertical opening associated with at least one string of the stringed instrument to which the accessory is attached. The adjustment rod has an upwardly angled inner end within the vertical opening in the body. The dampener comprises a dampener body; a soft fabric covering a top surface; and a bottom surface having a horizontal groove with a downwardly angled top surface matching the angle of the angle of the adjustment rod. Moving the adjustment rod inwardly moves the dampener upward and applies pressure to the string; moving the adjustment rod outwardly moves the dampener downward and reduces the pressure on the string.