There is an article on the Wah-Wah pedal in the Sunday (7 August 2011) edition of the New York Times, covering the top 2/3 of page 3 of the Business section: "With a Flip Of a Knob, He Heard The Future", by Amy Wallace in her "Protoype" column (Bright Ideas page).
Using data in the article, I dug a little. The founding patent is US 3,530,224. Searching for patents that reference this patent will likely uncover the whole of Wah-Wah alternatives.
Using data in the article, I dug a little. The founding patent is US 3,530,224. Searching for patents that reference this patent will likely uncover the whole of Wah-Wah alternatives.
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