@dc42 thank you for responding. Will this input work as a live control that is sent direct to the extruders according to the joystick control without a program running?
With this setup I intend to have the robot and main extrusion control on one Duet and these multiple extruders adding various mixtures according to the position of the joystick on another. So the other system will be taking care of all the movement and this system will just be adding to the slurry on the fly.