I don’t understand the first sentence? I have outlined two scenarios in this thread, first - recording a guitar track using a VST insert amp modeler plugin like Amplitube…and the second - using a second track to bounce the first track to. With the first scenario the input is my audio interface channel with my guitar coming in via a radial direct box. With the second scenario, the input to the original track would not matter, but the input to the new bounce track would be the original guitar track that I just recorded. Make sense now?
And for your second comment, its a matter of saving time. When I bounce a lot of tracks over the course of a project that extra time adds up.