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The 2 Stage Fuzz Blend is two shunt feedback, high gain bipolar transistor stages that are connected to opposing ends of a potentiometer control, typically labelled "FUZZ," that allow the final output to be a blend of the two stages. There is no reason that the 2 stages need to be simple shunt feedback amplifiers, but this allows for the simplest arrangement with maximum gain from 2 independent transistor stages. Every example I have seen of this type of blend fuzz uses shunt feedback amplifiers.
This is an interesting spin on the cascaded amplifier idea. The signals at each end of the fuzz control are 180 degrees out of phase with each other. The second stage will distort the signal significantly, so the signals will not match and cancel completely, but some cancellation from the out-of-phase mixing must be occurring. A potential variation on this idea would be inverting one of the signals for in-phase blending.
The original 2 Stage Fuzz Blend pedal appears to be the Mosrite Fuzzrite circa 1966. It is unknown if this was or was not based on the earlier Rhodes fuzz box which was a small production of units made by Orville "Red" Rhodes in the early '60s.
Examples:
Mosrite Fuzzrite
Orpheum Fuzz
EH Axis
Guild Foxey Lady (2 knob versions)
Shin-Ei FY-2
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