Very cool vintage analogue octave pedal from back in the day that was bought and never used. It's New Old Stock and quite a lot of fun. One of the best descriptions of it's sounds I've seen online were the following:
There are those who might slight the Arion MOC-1 Octave for it’s less than stellar tracking. I say those people are trying to convey there own sense or puritanical perfection upon a device that was never intended to live up to it. Its very charm is in the fact that it refuses to be tamed by the simplistic ideas of notes and chords. While it certainly can follow your single-string riffage, only those who are willing succumb to it’s understanding will be able to experience the power of it’s clairvoyance. Play a well defined chord and it will search in and out of the ether realms for the notes you truly intended to play.