OK. Thanks for clearing that up. For some reason I thought both pins 2 and 3 had to do with the input at the same time. I guess I don't fully understand how the opamp works. Pin two would only be live if it was used for inverted signal then?
if pin2 is not grounded, it can be used as the -IN input.
It usually picks up the Signal Return, the NFB loop and the input filters.
This more usual arrangement allows complete separation of Signal Ground from Power Ground.
But, the 386 is not an opamp in the usual sense.
It allows single polarity supply and yet gives an output referenced to Power Ground. That is unusual.