As guitarists and bassists develop better technique, we often discover there seem to be tuning inconsistencies with our instruments that can’t be addressed by plugging into a tuner. Over the years that I’ve played, I have discovered that there is an inherent problem with all of my instruments in a certain portion of the fretboard range. In the process of trying to understand the problem space, I had to do a little math and physics. See? Beneath its firebreathing veneer of rebellion and self-expressive freedom, rock and roll is actually science! And all this time we thought we were being so anti-establishment. Well, at least we can say we’re putting our science to work.
Let’s start at the beginning of the problem with “this thing isn’t in tune”… these issues need to be fully addressed before we can derive any benefit from discussion on microtuning.
Tuning Issues
If you find your guitar or bass won’t play in tune, there are several things worth examining.
- First of all, make sure your strings are relatively new (less than one month old). Old strings, especially if they’re really dull looking and cruddy, will not properly stay in tune. If in doubt replace them and allow the new ones to stretch a bit before proceeding.
- How is the neck relief? Sight down the guitar fretboard, looking from the bridge to the nut. If you see an obvious bow / curve / twist in the fretboard, you need to adjust the neck relief. You should also be able detect any serious fret problems this way (see #4 below). Adjusting the neck relief isn’t terribly difficult, but if you aren’t experienced in making this adjustment I’d suggest you have a luthier show you how it’s done. The key here is to make SMALL adjustments; no more than 1/4 turn of the adjustment nut at a time. Warning: overtightening can break the truss rod, and this is the very definition of the word “bummer”.
- Your tuning issues might be due to improper string action. Check the height of the string above the fretboard. If there is too much distance from the string to the top of the fret, there will be too much deflection when you fret (you’ll always be pulling the string sharp when fretting). This needs to be adjusted at both the bridge and at the nut. Adjusting the bridge is simple. Adjusting the nut slots is not. I recommend you have a luthier handle any nut adjustments.
- It could also be your frets. If the frets are improperly crowned you’ll find tuning isn’t consistent on fretted notes. Sight down the fretboard and take notice of any unusual frets. If you see deep ruts in the frets or they seem really tall, flat, or radically different from each other, it might be time to ask a good luthier for an assessment.
So if you’ve checked all these things and carefully tuned the open strings with a good tuner, only to find your guitar or bass still doesn’t seem in tune when you’re playing, it might be time to check your intonation.
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