MODIFICATION The FZ-1 - CB style

I don't like to encourage off-topic discussions, but I'll answer the last two questions, then I'm done.

The STABILITY control allows the various stages to talk to each other via the power supply rail. Normally not a good thing, but it can be used to create oscillation, gating and other weird behavior.

That 47uF cap is for filtering power supply noise and is on the upstream side of the STABILITY control, so it has no effect on how the STABILITY control operates.
 
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