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Three new nodes for post-generation quality improvement: - SelvaHarmonicExciter: multi-band exciter (HPF → tanh saturation → mix) restores harmonic richness lost in BigVGAN HF reconstruction - SelvaFlashSR: audio super-resolution via FlashSR basic model (haoheliu/versatile_audio_super_resolution, requires pip install audiosr) predicts missing HF content above vocoder reconstruction ceiling - SelvaOutputNormalizer: BS.1770-4 LUFS normalization + true peak limiting for consistent loudness on generated outputs (pyloudnorm) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>