are you asking about individual parts OR live vs. multitracking? (if the former, within the rock genre) i'd say for me, it depends on the instrument; drums: i usually try to ride the drummer pretty hard... if i know they can hang with the click, i start critiquing dynamics, if they are rock solid and have excellent studio technique we push straight through (MAYBE patching a fill if it's the one thing that stands out on an otherwise awesome take). if they are too sloppy and (by some drastic oversight) i'm committed to the band, i (reluctantly) resort to punch recording (trying to avoid cymbal wash like the plague). bass: (again, depending on the caliber of the player) i try to get one solid pass, and make small punches if necessary (bass edits are imo, the easiest to make). acoustic/keys: one tone, one pass. electric guitars: i like getting different tones for different parts, usually switching guitars/amps/pedals. if it's a bluesrock/throwback/retro sound i might stick with the same tone, but will almost certainly punch (as i find guitarists -myself included- to have universally inferior tempo) vocals: (depending on the temperament/confidence/ability of the vocalist) i give them a few passes, asses, and adjust recording process as necessary.