Oh, those are meant to make the intonation absolutely perfect.
I believe the technical term is "true temperament" but I'm kinda drunk.
I think that is what he said. True temperament. That seems to be a quality innovation
They're pretty unique. I have some fan fret, but not one of those. Fan fret is also a good attempt.
Every guitar is, by its nature, out of tune at some points along the fretboard. There are a variety of ways to try to fix this, including what you showed in the video thumbnail (I didn't watch it). Fan frets are another.
Another one is microtonal - but that's not only partially going to compensate and is more about getting things like quarter steps between the notes. So, instead of an F# and a G, you have a note between them.
Every now and then when I am writing some music there is a tone I am looking for that is between two notes where a microtonal neck would help me, but that does not happen often at all. And I can hear certain chords in certain places on the neck are a hair out of tune on a sting here or there when the guitar is in tune
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