Add an octave to your guitar play for a peculiar sound. With a clean sound, it will sound as if somone else is playing with you on a lower-tuned guitar. With a decent overdrive, you will literally crush walls with a full and intense heavy metal sound. Just play some power chords or tune to drop D and the pedal will do all the rest. When solo-ing, the pedal gives a funny 'double' sound.
Excellent condition