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Octave effect

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OC-2 unit generates tones at one and two octaves down from the input signal. This effect also uses flip-flops to generate square waves at 1/2 and 1/4 of the input signal frequency, but rather than simply mixing in these signals, it uses them to invert the polarity of the input signal on every other
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lower or higher than the original. The synthesised octave signal is derived from the original input signal by halving (octave-down) or doubling (octave-up) the frequency. This is possible due to the simple two-to-one relationship between the frequencies of musical notes which are separated by an
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the input signal with a carrier at half the input signal, creating new frequency components at 1/2 and 3/2 the input signal. The 3/2 component is low-pass filtered out. This more complex approach lessens the synthetic sound of the octave tones by making them more closely associated with the
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Octave Divider (about 1972) had a unique generator that tuned into the low octave as long as the input signal was strong and then continued generating the same frequency while that input signal faded.
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released the OC-5 which included features from both of the previous versions, as well as some new ones including octave up, poly/vintage mode, source switch and superior tracking engine.
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OC-3 (2006) has an additional mode called "Poly" where only a low note is added with the idea to add a bass line to chords. In 2020,
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Blue Box used this method to create a two octave drop (expanded to include one octave down in later re-issues).
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to "fold up" the negative part of the waveform to make a new waveform an octave higher in pitch.
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circuits to divide the frequency by two. This creates a buzzy synthesizer like tone. The
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cycle (every two out of four cycles for the second octave). This effectively
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which mix the input signal with a synthesized signal whose musical tone is an
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features an octave pedal on electric guitar, simulating the sound of a bass.
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octave. One of the first popular musicians to employ the octave effect was
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Octave-down effects are typically produced by converting the signal to a
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MXR Bluebox (reissue model), an octafuzz producing octave down tones.
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which digitally sample the sound and process it to change its pitch.
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original signal, and also makes the effect volume-sensitive.
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Audio Production Tips: Getting the Sound Right at the Source
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Octave pedals can be used in conjunction with fuzz (see
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"Octave effect"
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C Major scale with octave-down effect
Fuzz, distortion and octaver (electric guitar)
media help
effects unit
octave
Jimi Hendrix
octavia
harmonizers
pitch shifters

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