Multi-Stage Music Source Restoration with BandSplit-RoFormer Separation and HiFi++ GAN
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 the...
| Authors | Tobias Morocutti, Emmanouil Karystinaios, Jonathan Greif et al. |
|---|---|
| Primary category | cs.SD |
| Published | 4 March 2026 |
| Last updated at source | 4 March 2026 |
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