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POG stands for Polyphonic Octave Generator. It is a stompbox that can add one octave up and one octave down and blend them all together with the straight through signal. Unlike previous octave pedals which have been limited to effecting single notes this one is polyphonic and can work on chords. E-H say that not only can it make a standard guitar sound like a 12-string but it can even make it sound like an 18-string.
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