On Zebra3 beta dropdown don't seem to do anything

[Khr128]

It looks like the dropdowns are not hooked up to anything. On Zebralette 3 there is a dot at the parameter that is controlled by the dropdown, on Zebra3b there is no dot.

[tasmaniandevil]

I just assume you are speaking about the dropdown menus of the direct modulation slots, correct?
There is an up/down arrow to the left of the dropdown menu. Those arrows let you set the modulation depth.