Measuring host bases equalizer distortion

Wondering if anyone has an idea how to some sort of generation, through the EQ, (APO/Peace) and back in to measure the distortion.
I thought one could generate a tone through the EQ to a file, then read the file into RightMark or something.

I don't need much eq. I wonder which is cleaner, host based or something like the Schiit tank based little 6 band box.