Dude, it's even explained on the page.@audiofilet Actually the OP is using the Parametric EQ in the first post (where he thinks the curve does not look like Oratory's one), then in post #4 he goes for the GraphicEQ which it is a worse solution (resolution wise) but does the job done anyway.
ParametricEQ is the preferred solution if you don't have the FIR available (which solves phase issues also if I recall but I may be wrong) or you don't know how to make one and you can use more resolution to have fine tuning of the curves but usually 16/32K is fine (for example that GraphicEQ you posted has only 127 points, the 48kHz FIR is usually 100ms/4800 samples).
"Fixed band eq is more commonly known as graphic equalizer but in order not to confuse with EqualizerAPO GraphicEQ it is called like that in this project." https://github.com/jaakkopasanen/AutoEq#usage
It's true though, Parametric EQ is superior because it can control the bandwidth. On a graphicEQ it's fixed.
There is nothing relating to FIR on that github page you linked, please provide the exact link for the DT 770s.