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Message: [QUOTE="Bombastus, post: 92256, member: 2178"] A finished stereo file gives a processor two channels, while the original mix may contain dozens of independently controllable sources. Once those sources are printed together, a repair on the master works on their combined signal rather than reopening the faders, pans, effects, and microphone choices that created it. This does not make stereo-bus repair crude or pointless. Some mono problems only become meaningful when the whole mix is summed, and a targeted processor can improve those relationships without asking you to dismantle a mix that already works. The useful line is whether the fault belongs to one source or to the interaction of the finished stereo signal. [HEADING=2]A stereo master cannot reach back into the mix[/HEADING] Suppose a widened guitar loses body in mono while the vocal, snare, and synth occupy the same midrange. On the guitar channel, you can disable the widener, change a delay, alter microphone timing, or correct the offending band without touching anything else. On the stereo master, every processor sees the guitar mixed together with whatever else is sounding at that moment. Frequency-selective processing helps, but frequency is not ownership. Pulling or rebuilding energy around 1.5 kHz on a finished mix also reaches vocals, keys, percussion, ambience, and any other material living there. Mid-Side processing adds another dimension, yet it still separates shared and differential information rather than magically recovering the original tracks. The difficulty is formal enough to have its own technical field. [B][URL='https://pmc.ncbi.nlm.nih.gov/articles/PMC3855489/']Underdetermined stereo source separation[/URL][/B] deals with estimating more sources than there are recorded mixture channels, using statistical models because the original components are no longer directly available. Ordinary stereo-bus repair is not doing stem recovery, so it cannot promise source-exclusive edits inside a dense printed mix. This is why a known source fault is usually cheaper to fix upstream. If one chorus plugin makes a synth disappear in mono, correct the chorus. If a spaced microphone pair hollows out a guitar, adjust the recording or its track processing. Solving those problems before summing lets you change the culprit without asking unrelated sounds to absorb the side effects. [HEADING=2]Some mono faults still belong on the stereo bus[/HEADING] A different case appears when individual tracks behave acceptably but their combined stereo relationship produces a weak mono sum. Several wide elements may overlap in one section, or the finished balance may reveal a narrow frequency region where Side energy carries more identity than the center. No single track has to be broken for the complete mix to have a translation problem. Stereo-bus processing makes more sense there because the thing being repaired actually exists at the bus. Noisebud positions [B][URL='https://goldmidi.com/community/threads/noisebud-introduced-nbb-toc-for-mono-safe-stereo-mixes.77642/']stereo mono-compatibility repair[/URL][/B] for production, mixing, and mastering, with separate methods for selected spectral identity and destructive left-right phase. Used on a finished mix, those controls react to the combined stereo result rather than pretending to know which instrument supplied every component. A master-stage repair can also be practical when the multitrack session is unavailable. Old mixes, licensed instrumentals, client stereo bounces, live recordings, and archived projects sometimes leave you with only the printed file. The choice then is not between perfect source repair and bus repair. It is between careful processing of the stereo information you still have and leaving the problem untouched. Restraint matters more in this situation. A correction that sounds impressive in soloed mono can quietly alter stereo balance, center density, or another instrument sharing the same band. Level-match the result and move between stereo and mono often, because a master-bus solution earns its keep only when the repair costs less than the defect. [HEADING=2]Source-level repair wins when one element owns the problem[/HEADING] The decision becomes straightforward when you can name the offender. A bass widener, polarity mistake, stereo delay, modulation effect, badly aligned microphone pair, or one overdecorrelated synth gives you a direct place to work. Fixing it there preserves options that disappear after the mix is printed. Source access also lets you choose the right kind of correction. You can shorten one delay instead of rotating a whole frequency region, reduce one effect return instead of narrowing every Side component, or alter one microphone without changing the drum kit around it. Small cause, small repair. Bus repair earns its place when the problem belongs to the sum, when the exact source cannot be isolated cleanly, or when no session exists to reopen. Even then, the goal is not to make stereo and mono identical. It is to restore important musical information without charging the rest of the mix an audible fee. If a stereo-bus adjustment needs several compensating moves to keep the vocal, drums, width, and tonal balance where they were, the repair has crossed its useful boundary. Go back to the source when you can. A printed mix can be treated intelligently, but it cannot give back control that was never printed into the file. [/QUOTE]

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