In the RackUltra FX card’s installation instructions it says you have to remove the “DSP FX Card” from slot C, and the diagrams make it look like slots A, B, C, and D are all the same, so… hypothetically, could you replace the DSP FX card with a 2nd RackUltra FX card if you didn’t mind losing the original, non-ultra FX rack?
Also, what’s in slots A and B? How deep might this “add or replace a card” rabbit hole go?