This is the original POG by Electro-Harmonix, the octave pedal that gave birth to the POG 2 and the POG Nano. With the original POG, you can add up to two octaves up or one octave down to your signal and blend them together to your taste with each voice’s separate volume control. An added lowpass filter with switchable resonance gives you even more control over the tone and voicing you get from the POG.
Octaves are, in general, simple devices. Sometimes you will find the octave effect blended with other effects (like fuzz) in some stompboxes, but these are the controls you will see in an average pedal:
Octave 1. With this knob, you will bring into presence one of the octaves (i.e. the upper octave).
Octave 2. On the other hand, turn this knob clockwise and you will increase the volume of the down octave.
Tone. In some pedals you will be able to change the tone of the octaves, either with a single knobs or with two different, one for each octave.
