My best part of my PhD thesis is probably the paper on rising 'ja' (yes) and 'nej' (no) in Danish). It shows that these are used for affiliation in contrast to the 'normal' versions with level intonation. But it also shows how the rising pitch often (cor)responds to a wide pitch span in the previous turn, as part of making affiliation relevant.

Now your can get a version of this on ResearchGate (AAM, before layout and proofs)

https://www.researchgate.net/publication/348636560_Affiliating_in_Second_Position_Response_Tokens_with_Rising_Pitch_in_Danish

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I tweaked the #Intonation on my main #Guitar. Not all the strings, just three of them that needed it.

Since I was about 19 years old, I developed a good way of doing it. What you don't want to be doing is just matching the 12th fret harmonic to the 12th fret note. That's good for acoustic guitars.

On electrics, where people hear your bad intonation the most is your soloing above the 12th. You need good relative tuning among the high notes in that area of the neck.