Octave twelve the ""Mando-guitar"" from 1964 to 1968. Notable users of the Mando-guitar include Brian Jones of The Rolling Stones. Most modern octave twelves are modeled after the distinctive body shape of the Vox Mando-guitar. (Some believe that George Harrison of The Beatles used it on the song "Words of Love" in 1964, but the Mando-Guitar was not introduced until the following year.) It was (and may still be, in live performances) also used on the introduction of The Beach Boys' "Wouldn't It Be Nice", from "Pet Sounds". Octave twelve An octave twelve is a type of 12-string guitar fitted with a
Octave effect performances. Hendrix used an octave-fuzz pedal known as the octavia. Analog octave effects differ from harmonizers and pitch shifters which digitally sample the sound and process it to change its pitch. Octave-up effects usually use full wave rectification using diodes to "fold up" the negative part of the waveform to make a new waveform an octave higher in pitch. Octave-down effects are typically produced by converting the signal to a square wave, and then using flip-flop circuits to divide the frequency by two. This creates a buzzy synthesizer like tone. The MXR Blue Box used this method to create a