However, we perform the psychoacoustic analysis directly from the input sequence or the output of MDCT. The psychoacoustic info used as masking curves has no business with the shaped MDCT coefficents. Ideally, we should also take some adaptations to the masking curves by the info feed back by pre-processing tool. As for M/S, it might be a easier task. But for TNS or another ones, it relates to a cross-domain management which needs complex consideration and seldom mention by publized literature.