External Effects-Routing-Newb

Last night I set up a group track. First time I ever used one of those. It automatically loaded up with a stereo out as the input bus.
So then I just ran cables to the Eventide Space and from there back to the stereo in of my interface.
I still got feedback. Is what I described what you wanted me to try?
I don’t understand the “sends” part here in your latest description.