The Death By Audio Robot is a manic 8-bit pitch transposer fuzz that's become somewhat cherished among experimental guitarists. It does octave up, octave down, and it even has an arpeggiator function. Rabea Massaad got one in the mail directly from the manufacturer and made this demo of it. https://www.youtube.com/watch?v=ysLMoburfzYClick on the title for more