Hi, this is an alternative to both an octaver or, and a chorus for "thickening filling out the sound". I find it more natural, it's almost the equivalent of a guitar power chord, it takes the note you play (preferably the root) and adds the fifth note up, but so it can be distinguised from the note played I've given it a small delay. This I find to have quite a few uses: ear training, making a more complete sound in a groupe with one guitarist, playing bass alone, allowing people to hear the bass player on little computer speakers!