So... when a musician talks about "punching in", I know generally what they mean. But how does it ACTUALLY happen?
So assume it's a guitar part, and the original is on Track 1. Does the engineer actually hit record on Track 1, or does the player put the "new" part on another track? Or could it be both (the first sounds harder). How much does the player actually play? Or does that depend on what the punch in is?
Then, assuming you have it on another track - say, Track 2 - does it get blended in the mix? Do they fade out Track 1 and fade in Track 2?
Does anyone have a good example of a (bad) punch in where you can clearly hear what's the what?