In order to remaster an old recording made before modern digital processing, reverse engineering the original mix would allow for improving on the final mix. Two algorithms based on least-squares optimization allow the parameters of time-invariant processes, such as gains, delays, panning and filtering, to be estimated if a raw multitrack recording and the final targeted mix are both available. Theoretical and experimental results show that under specific assumptions the proposed method can precisely and efficiently retrieve the original mixing parameters.
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