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arXiv · 2603.04032

Multi-Stage Music Source Restoration with BandSplit-RoFormer Separation and HiFi++ GAN

Tobias Morocutti·Emmanouil Karystinaios·Jonathan Greif·Gerhard Widmer
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Abstract

Music Source Restoration (MSR) targets recovery of original, unprocessed instrument stems from fully mixed and mastered audio, where production effects and distribution artifacts violate common linear-mixture assumptions. This technical report presents the CP-JKU team's system for the MSR ICASSP Challenge 2025. Our approach decomposes MSR into separation and restoration. First, a single BandSplit-RoFormer separator predicts eight stems plus an auxiliary other stem, and is trained with a three-stage curriculum that progresses from 4-stem warm-start fine-tuning (with LoRA) to 8-stem extension via head expansion. Second, we apply a HiFi++ GAN waveform restorer trained as a generalist and then specialized into eight instrument-specific experts.

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Tobias Morocutti, Emmanouil Karystinaios, Jonathan Greif, Gerhard Widmer. 2026-03-04. Multi-Stage Music Source Restoration with BandSplit-RoFormer Separation and HiFi++ GAN. https://arxiv.org/abs/2603.04032

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