The CA3130 is a simple CMOS opamp. I'm not sure what you mean by "built-in output voltage regulators."
In this circuit, the opamp's inputs and outputs are operated near ground. Not all opamps have that capability. The CA3130 does. The TL072 does not. The requirements for the servo opamp in this circuit is that it must have very low input bias current (FET input) and the inputs and output must be able to operate at the negative rail (ground). The CA3130 is not the only opamp that meets these requirements, but it is readily available and relatively inexpensive ($2 ea at Tayda). The CA3130 shows up in other pedal designs; some by me, some by others, like Bjorn Juhl. This is the simplest implementation of the servo control. There are ways to make the TL071 work, but it takes more parts. There are other rail-to-rail opamps out there.