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attack time "0" means that the limiter has "lookahead" capabilities. meaning, it analyzes the audio signal and predictively attenuates, effectively achieving a zero attack-time. in contrast, an analog limiter can never achieve a zero attack because it reacts to the signal.
brickwall does, indeed, refer to the limiter's ability to keep the amplitude of the signal from exceeding the set output ceiling, which may or may not be 0 dBFS. but this is made possible by the "lookahead" feature.
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