I got a Hungry Robot Monastery pedal a little while ago. It's +1 and -1 octave. There's two "presets" you can use. There's a blend knob for the mix and a blend knob for the octaves. It's dead simple and sounds pretty cool. I made a video with a few different ways to use an octave pedal like this. After a reverb, in the effects loop of a delay, with drums and a few other applications. I was just trying to experiment and see how much I could come up with using a simple octave pedal. Check it out if you want . Got any other cool ideas for an octave pedal? The FX loop move sounds especially cool in my opinion.