Positive and Negative regulators sections are different

[Davewalker5]

but I'm guessing it controls the feedback for the op-amp and therefore controls the regulation

I was guessing the same as you

 

[Davewalker5]

Here is series pass transistors that are back to back for the Positive supply and Negative supply

Take a look please

This circuit has a name, it's in my Floyd electronic book i will look it up