A wah-wah pedal (or simply wah pedal) is a type of electric guitar effects pedal that alters the tone and frequencies of the guitar signal to create a distinctive sound, mimicking the human voice saying the onomatopoeic name "wah-wah".
The pedal sweeps the peak response of a frequency filter up and down in frequency to create the sound, a spectral glide, also known as "the wah effect".
After the installation, Page began playing his saxophone through the pedal and had asked Joe Banaron, CEO of Warwick Electronics Inc./Thomas Organ Company, to listen to the effect.
At this point the first electric guitar was plugged into the prototype wah pedal by guitarist Del Casher who suggested to Joe Banaron that this was a guitar effects pedal rather than a wind instrument effects pedal.
The un-modified version of the Vox wah pedal was released to the public in February 1967 with an image of Clyde Mc Coy on the bottom of the pedal. The patent application was submitted on February 24, 1967 which included technical diagrams of the pedal being connected to a four-stringed "guitar" (as noted from the "Description of the Preferred Embodiment"). was granted US patent 3530224 ("foot-controlled continuously variable preference circuit for musical instruments") on September 22, 1970.
Early versions of the Clyde Mc Coy featured an image of Mc Coy on the bottom panel, which soon gave way to only his signature.
The US-made Vox product line development was headed by musician and bandleader Bill Page.
The video also provides plenty of details about each model -- but for more info, check out Vox
During the re-design of the USA Vox amplifier, Stan Cuttler, head engineer of Thomas Organ Company, assigned Brad Plunkett, a junior electronics engineer, to replace the expensive Jennings 3-position MRB circuit switch with a transistorized solid state MRB circuit.
Plunkett had lifted and bread-boarded a transistorized tone-circuit from the Thomas Organ (an electric solid state transistorized organ) to duplicate the Jennings 3-position circuit.
Banaron, being a fan of the big band style of music, was interested in marketing the wah pedal for wind instruments as suggested by Page rather than for the electric guitar as suggested by Casher.
After a remark by Casher to Banaron regarding the Harmon mute style of trumpet playing in the famous recording of "Sugar Blues" from the 1930s, Banaron decided to market the wah-wah pedal using Clyde Mc Coy's name for endorsement.