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Searching For Music Mixing Graphs: A Pruning Approach

3 June 2024
Sungho Lee
Marco A. Martínez Ramírez
Wei-Hsiang Liao
Stefan Uhlich
Giorgio Fabbro
Kyogu Lee
Yuki Mitsufuji
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Abstract

Music mixing is compositional -- experts combine multiple audio processors to achieve a cohesive mix from dry source tracks. We propose a method to reverse engineer this process from the input and output audio. First, we create a mixing console that applies all available processors to every chain. Then, after the initial console parameter optimization, we alternate between removing redundant processors and fine-tuning. We achieve this through differentiable implementation of both processors and pruning. Consequently, we find a sparse mixing graph that achieves nearly identical matching quality of the full mixing console. We apply this procedure to dry-mix pairs from various datasets and collect graphs that also can be used to train neural networks for music mixing applications.

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