The devices did not account for an important factor present in all pianos called inharmonicity. It is because of those devices that people gained such disdain for tunings completed by an ETD.
Those ETD's did nothing more than measure frequency. So, why do some people insist that their pianos be tuned by ear? Electronic tuning devices (ETD's) were first invented in the 1930's. Related: International Survey on ETD Use for Concert Piano Tuning Just as in the example of writing, using a machine can help a piano technician work more efficiently with less strain on their body, specifically their ears.
Once the technician has done so, they can achieve equally beautiful and correct tunings by both methods. The technician must know what makes a proper tuning and how it is achieved, by ear and by machine. Just as an author must master their language, a piano technician must master the theory of piano tuning. What is more important than the method of getting words on paper is the author's understanding and mastery of the language in which they are writing. An essay that is handwritten can be better than, equal to, or worse than a typewritten essay. It is easy to see the fault in such a request. I demand that it be handwritten because handwritten essays are always better.
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