Control material - factor inside a Linked Model with Proxy Armature ?? How 2 do it?

Hey mates,

is it possibel to :confused: :

Control the material factor (mixnode) inside a linked model (group)
from the outside through a bone movement of the (proxy) armature … ??

es easy as possible without deep custom python coding :eyebrowlift:

^^ I don’t want to append the model into the scene or so :wink:
… ??

You can add a driver to the mix factor (right click it and hit “add driver”). Then use this driver to connect it to something or other on the control rig, like a custom property or the location of a non-deform bone.