Rock guitarist and singer jimi hendrix used which element to create an original sound

I believe the correct answer is: wah-wah pedal.

Rock guitarist and singer Jimi Hendrix used wah-wah pedal, which is a type of electric guitar effect pedal that changes the tone and frequencies of the guitar signal (mimicking the human voice), to emphasize the "sweet spot" in the tonal spectrum. It is believe that Jimi Hendrix learned about the pedal from Frank Zappa.