Patent ID: 6956158

Claim:
A method of determining the position for a fret on a fingerboard for a stringed instrument having strings of different scale lengths, the method comprising the step of interpolating between, or extrapolating from, a fret position on a first reference fret scale and a corresponding fret position on a second reference fret scale, the second reference fret scale being perpendicular to the centreline of the fingerboard; wherein the scale length of the second reference fret scale is give by: scale ⁢ ⁢ length ⁢ ⁢ of ⁢ ⁢ second ⁢ ⁢ reference ⁢ ⁢ fret ⁢ ⁢ scale = mid ⁢ ⁢ scale × spacing ⁢ ⁢ difference scale ⁢ ⁢ difference . ( 1 )