Purchased two octave pedals, Boss OC-2 (eBay) and MXR bass octave. Neither seems to work well with any of my active basses (MTD AG6, Fender Am Elite 5-str, FBass BNF-5, Fender MM 4-str). Only appear to work when basses are in passive mode, otherwiase the sound is very distorted and no clear octaves. Read in a blog it could be dead spots on the neck maybe? Any ideas or suggestions would help... MXR said the signal was overdriving (to hot) the effects circuitry? Is the 3leaf audio octabvre any better for active basses?: