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This paper proposes that the Indus Valley Script (IVS) is not a natural language but a technical resonance notation system encoding acoustic and electromagnetic wave physics parameters using a five-category grammar. Version 4.0 presents six independent lines of evidence, including two new pillars added in this version: a deep time foundation establishing wave-pattern encoding as a pre-agricultural human universal, and cross-cultural museum evidence demonstrating acoustic instruments misclassified as utilitarian objects across six civilizations. Pillar 1 — Cymatics Visual Matching: 34 core IVS signs map directly to documented wave physics diagrams with high or very high confidence, covering approximately 80% of corpus frequency. Pillar 2 — Oracle Bone Cross-Civilizational Corroboration: Eight direct sign correspondences with preserved Chinese linguistic meanings independently confirm wave physics interpretations. Pillar 3 — Dholavira Signboard Decipherment: The longest known IVS inscription produces a coherent operational sequence explaining all ten signs including the previously inexplicable 4x repetition. Pillar 4 — Helmholtz Physical Validation: Three government-documented Indus perforated vessels calculate to Concert A (444 Hz), Middle C (260 Hz), and Sitar open G (92 Hz). Pillar 5 — Deep Time Universal Encoding: Gault Site incised stones dated 13,400–12,800 BP display identical geometric wave vocabulary, eliminating the cultural diffusion objection entirely. Pillar 6 — Cross-Cultural Museum Evidence: Helmholtz analysis of the San Antonio Museum of Art collection reveals acoustic instruments misclassified as lamps, censers, and jewelry across Egyptian, Roman, Greek, Islamic, Chinese, and Maya collections — with Concert A (440 Hz) appearing independently in Egyptian terracotta and Greek electrum, and Middle C (261 Hz) appearing independently in Greek and Maya ceramic vessels separated by centuries and thousands of miles. The Indus Valley Civilization operated the world's oldest documented acoustic calibration system. The instruments survive in museum collections worldwide — misidentified but intact, and now calculable.