alt Hacker NewsThe more reliable guitar tuners do something like this. You clip them on the neck, and they detect vibrations in the wood rather than from sound in the air.
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soperj • yesterday at 4:11 PM
oddly, this is how I learned to tune my guitar. I'm pretty tone deaf, but can feel the difference between the reference string and the string I'm trying to tune through the guitar.
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Violin/other strings tuners tend to have this mode for orchestra uses with many people next to you also making sounds.