Search by tag : If you find that when you play your guitar, some chords are in tune and others are not, you likely have one of two problems. Either your neck is warped, or your bridge needs calibrated. Each string requires a very specific distance between the saddle, on the bridge, and the nut. This distance can be variable based on the distance between the frets on your guitar. This method will work to adjust guitars and basses with independent saddles.