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Near the bottom of the page, they're listed as TL022CP dual op-amps
I'm asking about the Sallen-Key high pass filters (which includes the op amps). I thought each potentiometer would cut or boost a band (band pass filter) but I don't see an LPF paired with each frequency midpoint.
IC1-3 are gyrators
your schematic looks more like a multiple feedback BPF
However, I was wondering about the frequency response. It seems like if it's a gyrator, it is a notch filter as in the attached image from sound.whsites.net.
I thought that an EQ like this would be in a band pass configuration (parallel C). Is this 7 notches?
This low impedacne is coupled into the feedback path of IC4 (pins 1, 2, 3) to cause either a boost or a cut