Abstract: A deflection correction device includes a first rod-like member provided in stringed instrument necks; fixing members attached to end parts of the first rod-like member; a screw hole formed so as to pass through the fixing member; and a second rod-like member provided with a screw shaft part screwed in the screw hole, and attached to the fixing member. The fixing members includes fitting grooves fitted on the end parts of the first rod-like member; shaft holes passing through the end parts of the first rod-like member from side surfaces of the fixing members; and a shaft member inserted in the screw holes. The fixing members are fixed to the end parts of the first rod-like member together with the shaft member, and by rotation of the second rod-like member, both the fixing members are pushed in a direction drawn to or away from each other.

Abstract: A fret leveling apparatus that is configured to provide leveling of frets on a fret board of a stringed instrument such as but not limited to a guitar. The present invention includes a body wherein the body in its preferred embodiment is rectangular in shape. The body includes a first end and a second end and further has an upper edge surface and a lower edge surface. The lower edge surface is operable to engage the frets during use of the present invention and has an adhesive material secured thereto. The body includes a first aperture and second aperture having a first height adjustment member and a second height adjustment member operably coupled therein. The first height adjustment member and second height adjustment member are constructed so as to provide calibrated incremental height adjustment of the body with respect to the fret board once placed thereon through rotational movement.

Abstract: A multi-stringed musical instrument, such as a guitar, having a neck with a partially hollow interior containing a number of linear actuators, each connected to a fret which projects proud of the neck and is in contact with a taught string, wherein the linear actuators are controlled by means of a user-selected input signal via functional communication with a small control panel, tablet, smartphone, computer or laptop.