[BlandDuck]

Totally. Also, an attenuator is easier and cheaper to implement, because it just requires normalizing V+ into the jack plug. An offset requires an adder.

My preference is: attenuator < offset < attenuator + offset. I see no benefit of having to remove the knob to get to the jack as proposed in the article.

[nine_k]

The benefit is saving space. Imagine a 10x10 grid of such jack / knob inputs.