How are the different ControlsNets and T2I adapters combined?

[kliyer-ai]

Basically the title. ControlNet uses zero conv layers to influence the standard SD model. Are they just summed up here? Thanks!!

Update:
Okay I figured it's probably the UnetHook class in hook.py that I have to look at.

Seems like it's just getting added in cfg_based_adder which is called in the forward function for each ControlNet model: