The real question is whether 1 mm lateral movement of the string is enough to change the pitch to make it sound out of tune. If you watch youtube videos of concert level guitarists, you see lateral movement of the strings often. As to "it should be possible to alter your left hand finger positions and return the strings to true", that may be easier said than done. It's like saying: "it should be possible to alter your left hand technique so you don't get string squeaks", also easier said than done.Beowulf wrote: ↑Mon May 22, 2017 4:34 pmYes, low tension strings are easier to move and if the guitar's action is high, and/or the frets are tall, this will also increase the pitch change. If 1mm is sufficient to alter the pitch, it should be possible to alter your left hand finger positions and return the strings to true. Does this resolve the tuning issue?
Then, I would surmise that the instrument in question has an intonation/setup issue. Yes, string gauge does affect intonation (thinner flattens and thicker sharpens), however if the instrument is set up as well as it can be for a particular string gauge there should not be problematic tuning issues. The guitar may have been setup up for higher tension strings and if the setup is good (neck relief, saddle compensation (and nut if the luthier was that precise), action height, fret height) then it should be possible to adjust for the different strings. If the frets were not positioned correctly...oops! If the use of higher tension strings corrects the problem, then the guitar is very sensitive to string gauge due to having been setup for higher tension strings. Note that higher tension strings will change the action height due to small changes in the neck relief and vertical pull on the bridge.
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