[. . . ] This system was developed to correct the mismatch of harmonics and fret position alignment inherent on all fretted, string instruments that utilize the standard fret position formula and typical tuning methods. [. . . ] This system was developed to correct the mismatch of harmonics and fret position alignment inherent on all fretted, string instruments that utilize the standard fret position formula and typical tuning methods. Simply put, this is what causes chords to go out of tune as you change positions. QC63550 0103 Printed in Japan I How to tune the system : 1. ) Tune your guitar using your normal tuning procedure (scope). 2. ) Tune the 5th string (A) fretted at the 5th fret compared to the open D string (unison). 6. ) Tune the open 1st string (E) compared to the 2nd string (B) fretted at the 5th fret (unison). Once you have experienced the benefits of the FretwaveTM, you will be amazed at the tuning accuracy, especially when you go back and play a standard guitar without the compensated bent fretsTM . E Chord A Chord D Chord G Chord C Chord U. S. Patent #5760322, "Fretwave" and "bent frets" are trademark of I. [. . . ] Once you have experienced the benefits of the FretwaveTM, you will be amazed at the tuning accuracy, especially when you go back and play a standard guitar without the compensated bent fretsTM . E Chord A Chord D Chord G Chord C Chord U. S. [. . . ]