ProGuitarShopDemos | 2 decades ago

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The Electro Harmonix Octave Multiplexer is a unique octave effect featuring high and low pass filtering for dialing in the sub octave you want. The Electro Harmonix Octave Multiplexer is a versatile octave effect for any instrument. - http://proguitarshop.com/store/octave-pedals-electro-harmonix-octave-pedals-c-114_277/electro-harmonix-octave-multiplexer-p-288