Palm pedal
A palm pedal is a mechanical device that consists of levers attached to the strings of a guitar or other stringed instrument for the purpose of pulling the strings up in pitch to a preset half-step or whole-step.
The palm pedal was invented by Boomer Castleman, an American guitarist and singer-songwriter, who designed the prototype in 1968.[1] Bigsby was the manufacturer of this product in the early 1970s. Pro Palm Pedals, a company in Nashville, manufactured palm pedals from 2009 to 2016, when owner Kenny Clark, closed the business, to pursue his musical career.
References
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