[quote name='EskimoBassist' timestamp='1319791803' post='1418543']
Fishman have just brought out something comparable, there's a thread on it on here. Personally I would look to combine a separate gain unit and harmoniser/octaver in one loop together. If it's say octave up and down you're after, you can't go wrong with the EHX Micro Pog, or if it's something more complicated you're after (say +/- 5ths, 4ths etc), perhaps look at the Eventide Pitch Factor? The Digitech Whammy also provides all kinds of cool harmonies and shifts. Combine any of those with a fuzz/distortion pedal of your choice and you'll get that sound.
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For me, then, it would be as easily obtained by putting Pog + Big Muff into a chain?