These questions were previously answered in
THIS THREAD that you started back in late July. To summarize:
While the octave-up circuit introduces a degree of distortion by virtue of how it functions, it is NOT a fuzz. The octave fuzz pedals, with the Octavia made famous by Hendrix being the best known, combine both fuzz and octave-up circuits into a single pedal. In the octave-up circuit, the function of the diodes is to provide full wave rectification of the guitar signal, not to give signal clipping.
If you take a look at the CJ Octave Up module schematic (below), you'll see that the two diodes are not paired together in opposite polarity as would be the case for signal clipping. They each do half-wave rectification on the guitar signal, which has been split into two equal signals of opposite phase at the 2N3906 transistor before them in the signal path. The half-rectified signals are then recombined into a fully rectified signal which has the octave-up overlayed onto the processed original signal.
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