Ok. Have some free time now.

Unfortunately I don't have L'Homme and his dingus. So I had to improvise with Antonia... or as she is appearing here as AntDingus.

(Texture wip mine, hand painted, and the sculpt specifically for this demo)

AntDingus has 3 morphs and I'd like to blend 2 of them with one dial in the least invasive way to the existing dials.

Head_Nozzle

Lovin' Vein

And Kaiju

I want a dial that mixes Head_Nozzle with Kaiju at once so I click one of the little white right pointing triangles and choose the Create New Master command...

This creates a new empty valueParm dial which I name Kaiju Head_Nozzle

This also brings up the keyed tab of the dependency editor with Kaiju Head_Nozzle ready to be set up. I'll start setting up my master dial by clicking Start Teaching and entering 1 in the dial on the editor or on the master dial that's been added to the parm palette, either works

I then go to the parm palette and set both Head_Nozzle and Kaiju to 1, remember to click outside the number field on the palette to enter rather than hitting the enter key. Apparently there's a bug with enter.

You'll notice that a new row of values appear above the number fields of the parms. This indicates a driven value in a dependency.

I then set the New Master to 0 and set Head_Nozzle and Kaiju to 0

I click Stop Teaching.

Now when I dial my new Kaiju Head_Nozzle to 1 it will cause both of the slaved morph dials to activate at an equal value. Dependant slaves.

Set desired limits and tracking speed in dial setting