Hi-pass/low-cut & low-pass/high-cut in the CAB block

We need a hi-pass/low-cut & low-pass/high-cut in the CAB block.

This has been mentioned a few times, most recently here.

It's a very simple feature, and it seems silly to waste a slot inserting a Studio EQ or GEQ for a VERY common need already present in almost every other modeler and IR plugin.

What led me to making this request is playing with Helix Native. Putting together a few presets patterned after some videos by Jon Symons -- Mesa Boogie Mark IV Lead Channel w/Ownhammer IRs -- I was still getting this brittle "hardness" up in the high end. Rolling off the high end in the Helix IR block took care if it and dramatically improved the feel. Easy fix.

I was never super satisfied with most Mesa Boogie profiles on the KPA... they always seemed to have this Marshall-ish gritty vibe to the distortion that Boogies don't have. Again, watching a Youtube video by nll, he delivers some great Mesa tones, and part of that recipe is an EQ block rolling off the high end like every other product does in the cab block.