@InvisibleInk I am answering this here so as to not move even further off topic in @Resolve’s Headphone Ranking thread.
What I am referring to is that there can be both Graphic and Parametric equalizers, in both digital and analog realms.
A graphic equalizer is an equalizer that has fixed frequency points you can adjust, with fixed bandwith adjustments.
A digital graphic equalizer is one that is obviously done in the digital realm, such as on a PC or phone, while still only offering fixed points of adjustment, like this for example:
An analog graphic equalizer is exactly the same set up, so fixed frequencies and bandwiths, just that it is done in the analog realm. These are the usual 10-band, 20-band, 30-band equalizers that were so common yesteryear, such as the one that @generic mentioned in the other thread or this one:
The Schiit Loki is the same, just that it has knob instead of sliders, but it is still graphic as it has fixed frequencies (and bandwiths) for adjustments:
Moving on to parametric equalizers, these are equalizers that allow you to select any frequency to adjust and also adjust the bandwith of said cahange. These can also be digital or analog, although it is very uncommon to see analog versions outside of studios, and even then they are not the most common thing to find in a studio.
A digital parametric EQ, as with the Graphic EQ, is one that is done in the digital realm. This is most commonly found on PC’s in DAWs etc. but there are plenty of hardware options that are common also.
For example, a digital parametric EQ on a PC may look like this:
But DSP units, such as BSS or MiniDSP, also have parametric EQ functions that you can control via PC or phone, but are hardware based (in other words, a standalone system).
There are also basic digital parametric EQ units that do not have any other functions other than equalization (whereas DSP units usually allow delays, mixes, source selection, etc.). An example would be this one:
Finally, the most uncommon, is the analog parametric equalizer. This is the same, almost, as the digital parametric EQ (allows you to choose frequencies, bandwith etc.) but it is done in the analog realm. An example would be this one:
Although they have also been commonly found (yesteryear) on some of the higher end mixing consoles.
There are also units that use digital control of analog parametric equalization, which is basically the same thing as above but with a digital UI to control it.
Now, I am far from an expert on these, I am only stating what I have learned from others over the years in various studios (which is the only place I have ever seen analog parametric EQ, either outboard or on a console), there are people on this forum with much more knowledge on the subject who could explain it better than I can, but here is what I understand (and believe to be correct, although there is no guarantee) about analog parametric equalizers.
While the analog versions still allow you to select frequencies and bandwidth etc, they are limited to a specific amount of frequencies you can select. This is due to the fact that each frequency uses a different circuit and each change of bandwidth needs to incorporate changes into the circuit, which results in the need of lots of analog components etc.
My understanding is that, while the analog parametric EQ is still considered parametric, it is actually quasi-parametric (I hope this term is correct) as there are limits to the frequencies that can be selected, it is not as “infinite” as a digital parametric EQ.
Anyhow, as I said, this is just my basic understanding of how the analog parametric eq works, so anyone with more knowledge on the subject, please feel free to chime in and fill in the blanks (and point out my mistakes, as it is always great to learn more!).
…if fiddling with knobs is your thing then fair play but you’re just doing what the set’s tuners should’ve done in the first place 
