Change other controls and params after changing a control

Hi!
I’ll intentionally take a simple example that could be implemented with the range control.
Say, I have LP and HP knobs for an EQ. I want to automatically change the value of the HP param and turn the corresponding knob every time when, manually turning the LP knob, I accidentally create a frequency overlap. I tried (I think) all the methods I found in the API, but to no avail :confused:
Thanks!