The biggest offenders are audio plugins, they tend to be very skeuomorphic, almost to a fault. I don't mind a little skeuomorphism, in fact I think it can help readability of the interface. But the way audio plugins take it to an extreme and cram as many rotary knobs in there as possible is maddening.
Even though I understand this need, I'm still very keen on audio software that tries to break out of the 'everything is a knob' paradigm when it makes sense.
That said, it's just a radio button, would you expect radio buttons to activate on scroll too? For continuous numeric inputs I modeled the slider, and enabled scroll control.
One issue there is intercepting horizontal scroll on touchpads is flakey and about two thirds of the time you go back instead of moving the thing right.
If you represent it as a knob then it's not though. A knob is something you turn, scrolling is the natural way to approach that.