Are there any octave pedals out there that don't crap out below standard tunings? I tune a full step down and have a really really hard time finding octave pedals that produce really clean subharmonics when I play an open D. The only things I've found that work well are actual sub-har. generators, but I know of no way to foot switch a rack mounted unit, and it seems like a bit overkill to have a rack mounted unit for one single effect, when that's not the intended purpose of it in the first place. I was looking at the MXR bass octave, and it boasts some nice claims..I didn't know if anyone had used this pedal or not. Any input is greatly appreciated..Thanks..