Inspired by the idea of using a FIR filter instead of changing cart loading (which won't work with my MC cart anyway) I created a FIR filter by "eye" in Rephase that looked like it would correct the FR of my cart according to "the script" and the STR-100 test record. It was easy and fast. I then applied the fir correction to the file I originally ran on the script with Foobar and it looks like it "worked". I can hear a subtle difference and of course I think I prefer the new FIR filter but I am sure there is bias involved. I guess it is "better" to have a flat FR response without any help from a filter but for these very subtle FR changes I am not sure a FIR filter is so bad.... it is a lot easier and cheaper than trying to find a NOS boron tube cantilever MC cart. See below original FR script, FIR filter in Rephase, and "after" FIR filter applied.