Crossfades will eliminate clicks but can’t do much for register jumping.
Bob, so I understand this, are you suggesting you think that the rendered song could sound better than if you recorded the playback in real time? That would be news to me.
I have no idea what you asked there, and no idea how you got that from my post.
Simplified explanation - I meant when two chunks of wav, clip one & clip two, are butted together end to end, the odds of where the line on the waveform ends on clip1 lining up with the start of clip2 are slim. The result would often be an audible click or noticeable change.
So they cross fade, one fades out, one fades in real fast. There's more to it than that, but the concept.
Nothing to do with recording real time or whatever you asked.