Is there a standalone octave pedal (that works well on bass, obs) that lets you adjust the wet/dry mix on the fly with a wah-type rocker? Ideally I'd like to be able to switch between octave up and octave down for different songs. I know it's relatively easy to do this with some of the more expensive rack mount stuff like Fractals, but I'm looking for something self-contained. I've researched it a lot, and haven't found anything. For a while I thought a Whammy pedal had a mode that worked this way, but in all the demos and write ups I've seen the pedal bends the note to the target interval, rather than blending volume.