Patent ID: 7728210

Claim:
A device for a string instrument comprising: a) a fretboard; b) a plurality of frets, wherein said plurality of frets are spaced apart from each other and extend transversely across the fretboard; c) a plurality of tensioned strings, wherein said plurality of tensioned strings are spaced apart from each other and extend laterally across the fretboard and perpendicular to said plurality of frets, wherein said plurality of tensioned strings may be oscillated to generate a tone, wherein the length of the oscillating part of said plurality of tensioned strings is varied by pressing the strings against a selectable fret for variation of pitch; wherein each of said plurality of frets comprises straight fret segments located beneath each of said plurality of tensioned strings; wherein each of said straight fret segment is displaced lengthwise along said plurality of tensioned strings for correction of tone interval individually for each fret.