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This paper presents a software-driven procedure for continuous assessment facilitating an evaluation of non-stationary sound quality. The noise stimuli are presented to the test persons via headphones and a subwoofer from a personal computer. The key feature of the rating procedure is the “zonal pairwise comparison” for the time zones at the beginning and the end of the noise sequences. Evaluation of data together with time variant objective parameters by means of statistical methods is described. The results and models from multiple regession analysis are given.