Butch Vig is known to track bands live for both the vibe and natural bass and drum connection. Bassists and drummers lock in to each other in a more organic way when they play together. And this allows the guitars to play more naturally as they would if it were a live concert.
He almost always isolates any guitar or bass amps and will often overdub or replace the guitar tracks, sometimes the bass track as well. But most times he keeps the drum takes.
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