This is a play around with octaves. It has sub, dry, +1 and +2. It has ADSR for getting organ type noise etc. It has reverb to help this too. It has filter and chorus for the higher octaves. And, not totally recommended, but it has distortion for doing sub-octave lead parts. That can be totally bypassed, though, to not detract from the main aim!
Let me know if any bugs or anything that needs tweaking as this was done quickly to satisfy my long-lasting GAS for certain similar guitar pedals.