Gilmore, a mechanical engineer whose day job is to make customized machinery for the military ammunition industry, started developing a mechanical self-tuning device in 1993. But, a new idea soon overshadowed the project.
One evening as Gilmore sat in his Kansas City home watching a “Cheers” rerun, he had the elusive inventor’s epiphany: why not run a current through each string to change its frequency? So, Gilmore walked over to his pile of instruments—he is an amateur musician from a long line of music men, including a great-grandfather who composed Methodist hymnals and a grandfather who was a bandleader, saxophonist and singer—and grabbed his steel string guitar. He hooked one string to the alligator clips of a variable desktop DC power supply and was able to change the string’s tuning by applying one or two volts.
The same idea, he thought, could be applied to a piano.
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