Hello,
I have not used the Grace Bix but it looks like the EQ section is made up of a low/high shelf. https://www.gracedesign.com/support/manuals/BiX_Owners_Manual_RevC.pdf
Using EQ/Compressor, you can get a similar EQ control by only adjusting the Bass and Treble controls (these are low/high shelf controls.) The frequencies of the low/high shelf in EQ/compressor are not the same frequencies that are offered in the Bix EQ circuit, so it will not be exactly the same, but it would be a good starting point. You could use the Bass and Treble controls as a starting point and the add in the other 2 bands if necessary.
https://cdn.eventideaudio.com/manuals/h90/1.9.7/content/algorithms/eq.html#eq-compressor
