I would like this as well. This would be great for some of my Marshall captures that have too much top end sizzle. With the current treble and presence controls, it’s hard to find the sweet spot. On other platforms, it is solved by cutting the highs off by the low pass filter, I can kill the nasty freqs but still have definition. Currently I could probably achieve this by doing an amp capture without the cab, and doing an IR seperately with the low pass applied, but to be able to dial this in on the editor would be an amazing addition.
My Tonex pedal has been sitting as a brick since I bought it because of no high cut and low cut. It’s not a gigging solution until it has those. IK Multimedia this would be the easiest update for you! Two basic filters!