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We present the Universal Proportional Coordinate System (UPCS) — a unified mathematical architecture centred on the multiplicative identity D/Δ, from which all proportional relationships in frequency, rhythm, dynamics, data addressing, and spatial geometry are derived as exact powers of the ratio 3/2. The system originated in the development of Music Motion, a Pythagorean microtonal instrument and sequencer system operating on 35 exact pitches derived exclusively from powers of 2 and 3 (3ⁿ/2ᵐ). Its central discovery is that the Greek letter Δ (Delta) — representing position zero, the multiplicative identity — corresponds exactly to the musical note D, its direct Latin descendant, which therefore occupies the only mathematically correct centre of the Pythagorean pitch space. The conventional placement of C as the root of the Western scale is identified as a notational convention; D/Δ as centre is a mathematical necessity. The UPCS is formalised by a single reconstruction formula: given any known value V at axis position P, the centre Δ = V ÷ (3/2)^P, and the complete geometric distribution follows as position(n) = Δ × (3/2)^n for all integers n. This formula is domain-independent: the geometry is invariant, only the anchor (V, P) changes between applications. The system is implemented across two complementary layers. The Greek positional layer performs exact fractional arithmetic using seven symbols (Φ Κ Γ Δ Α Ε Β) representing powers of 3/2 from position −3 to +3. The FKGDAEB storage layer encodes any data as base-7 symbol streams using the seven musical note names (F K G D A E B = 0–6), where 7³ = 343 > 255 allows lossless encoding of any byte. The Latin K is identified as the direct equivalent of Greek Κ (Kappa), representing note C at axis position 2− with ratio 4/9 — resolving a long-standing notational ambiguity. Applied to musical data protection, the system produces the .mmf / .mmb format architecture: .mmf is an open JSON archival format storing exact Pythagorean Hz frequencies; .mmb is a protected binary performance format produced by passing .mmf through a seven-axis dimensional encoder (7D FKGDAEB) with a key space of approximately 10⁴⁹ combinations, combined with HMAC-SHA256 signing. The cipher alphabet — the seven note names — is identical to the musical content alphabet, creating a self-referential protective architecture in which the security structure and the content structure share the same mathematical DNA. We further present the Music Motion Performance Intelligence Model — a four-pipeline computational architecture (Performance, Motion, Axiomatic, Antiquantize) that replicates the two-layer cognitive structure of expert musical performance. Pipeline 4 (Antiquantize) derives contextual micro-timing corrections — breath before melodic leaps, anticipation in stepwise motion, retardation at harmonic landings — deductively from interval arithmetic and tonal position, replacing the statistical "humanise" function of digital audio workstations with a deterministic, musically grounded system. The term "antiquantize" for this class of contextual micro-timing deduction is introduced here. All mathematical relationships are expressed as exact 3ⁿ/2ᵐ fractions. No roots of 2, no cents, no equal-temperament approximations enter the Pythagorean context. The system is implemented as a verified JavaScript database (MM-MASTER-DB v2.0) with automated self-testing confirming 0 errors across all 35 pitch ratios, all interval classifications, and all Two-Rule identities (APO × Lima = Tone; APO ÷ Lima = Comma). Keywords: Pythagorean tuning, microtonal music, exact arithmetic, proportional coordinate system, music information retrieval, data encoding, cryptographic protection, music technology, performance intelligence, antiquantize.