Microtones focus your attention to qualities of distance not available in equal temperament.
On an electric guitar, a slide can act as a quasi-third bridge allowing normally inaudible bi-tones to be amplified by pickups.
A slide can also trigger bi-tone multiphonics due to changing the proportions of the strings on the left side of the third bridge. Bi-tones are sometimes called ghost notes/tones in popular parlance, but this name only serves to obscure this well-documented aspect of string vibration.
On an acoustic guitar, bi-tones are normally audible and add to the complexity of the acoustic sound.
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