A digital audio effect for real time mixing applications, which aims to dynamically adapt to the multi-channel input has been implemented. The resulting signal process is the direct result of the analysis of the content of each individual channel with respect to the other channels. The implementation permits the enhancement of a source with respect to the rest of the mixture by spectral selectivity unmasking its content from spectrally related channels. A masking measurement approach has been also implemented in order to measure the efficiency of the algorithm.