Abstract: A computer-implemented method for decorrelating a set of simulated audio signals in a virtual environment is disclosed. The method comprises the steps of: obtaining a first set of decorrelation filters; evaluating the first set of decorrelation filters to determine a similarity metric representing the similarity between the first set of decorrelation filters; if the similarity metric is above a predetermined threshold, regenerating the set of decorrelation filters so as to reduce the similarity metric; and applying the regenerated set of decorrelation filters to the simulated audio signals.