Sorry, for the confusion. I meant that the mouse scroll wheel function can be assigned to the knobs, no problem. But alt/control + scroll wheel as a two key macro doesn't work on the knob. It says the code is wrong even though i referred to each code for all the keys to make sure it's right.

Since you do video editing, then you know the shortcut for zooming in and out is holding down alt and scrolling up/down on the mouse. That's what I want to achieve with just one knob.