How do you actually do a Jose mod on the Plexi models?

I have a Fender Showman out in the garage that I purchased in 1968 that I modified back then to use the normal channel to feed into the vibrato channel with clipping diodes offset with a DC voltage derived from the heater supply to control the clipping point. It worked really well. The Jose mode is similar to that in that combines extra gain into clipping diodes to simulate the symmetric distortion of an amp's power stage. The saturation switch in the FAS amp block plays a similar role.
 
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