The AS has internal mixing and switching options that we hide from you and present them as a high level list of routing options. It makes sence in a distortion box. In the C4 you get access to all the input and output routings and when used with the voices, you can create a huge list of routing options for yourself. I would suggest studying the Desktop Editor. It's very flexible and powerful.
Thanks - really appreciate you getting back to me on this!
As I don't own a C4 (currently just the AS, Manta and Neurohub so far!) would I be able to make any sense of the Desktop Editor for the C4 without having the actual C4 pedal to hand?