Detecting when CV is not patched into patch.Init()

Hey everyone. New here. Question regarding the Patch.Init().

I’d like to detect when CV is not patched into a CV input. Is there a “null” value or some kind of expected “no input” value I can look for when there’s nothing connected?

The use-case is a knob CV_4 controlling the wet signal of an effect. I’d like for that knob to be overridden when there’s CV incoming on CV_8.

My apologies if this is completely obvious in the examples/docs and I’ve missed it.

It’s not possible to detect jack insertion in software only.