Roger Mayer (engineer)

Roger Mayer is an electrical engineer who developed several electric guitar effects, including the Octavia, a fuzz effects pedal which also doubled signal frequency, with a sound that was not attainable by simply connecting an octave pedal and a fuzz pedal together. The effect was popularized by Jimi Hendrix, and can be heard during the solos on the song "Purple Haze".

The Octavia, as well as several other effects, are still being produced under Roger Mayer's name.