Volume Control for All... The Realist Docking Station is a no-fuss dock and volume knob that works with any (acoustic) string-bass pick-up. This “Universal Volume Attenuator” mounts to the instrument’s tailpiece without glue or fasteners. The ¼-inch input and ¼-inch output allows seamless integration to player’s current set-up. The volume attenuation is provided by a sleek anodized knob clearly visible and within the player’s reach so that he or she can clearly adjust on-the-fly.