KSTR
Major Contributor
The socketed 5532 DIP is sort of a dummy opamp, actually not needed (other than for part of switchable gains maybe) but designed in to appeal to the opamp-rollers, IMHO.Stock, it does include an NE5532; plus two OPA1612 elsewhere. I haven't opened mine; marked-up screen-grab here from JohnAudioTech video I posted back on page 7 of the thread.
The 1612 are on the input and fiter, and not the best choice for MM.