A double-octave pedal where you can blend in an octave up and an octave down. In addition, you can add a perfectly tuned fifth, or 5a on your root note, perfect for fast riffs or if you want to start mimicking certain organ functions. Classic octave doubling is cool, but throwing in a 5th up and giving all 3 modulated sounds their own volume control opens up a whole new world. Sound like a 12-string. Sound like an organ. Get rid of your dry signal and sound like a synth just owning that lo