Archival 78 RPM Shellac & Pre-1955 Mono LP Turnover/Rolloff EQ Matrix Restorer

Deterministic Differential dual-biquad inverse-RIAA cascade * variable RC turnover (250-800 Hz) & 10 kHz HF rolloff (-5 to -16 dB) pole-zero synthesis engine (.wav, .flac, .pdf, .json) built for Ortofon, Audio-Technica, CEDAR Audio, Esoteric Sound — zero-upload ephemeral Wasm RAM execution.

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