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The Electro-Harmonix Octave Multiplexer is finally back, generating deep, phat bass tones one octave below the notes you play into it. Dividing the Octave Multiplexer from other octave devices are the two separate smoothing filters that enable you to tailor your sub-octave signal to the exact bass sound you desire. Run your vocals through the Octave Multiplexer pedal and sound just like Ike Turner.Controls: High Filter, Blend, Bass Filter.Sub On/Off switch.1/4" input, dry output and effect output.DC power input for battery replacement.LED indicates whether effect is engaged or bypassed.