E490 — Duncan Fewkes reel analysis digest

⚠ No video on disk for this reel — referenced by the playbook but not in the local ingest cache. This file aggregates every playbook chunk section that cites E490. Sections are de-duplicated by heading. - 20 reels ingested (`reels-ingest/{shortcode}/`): - DT-prefix (E500–E521 era): DT0G7SyCtGg E519, DT2tfJzip8A E520, DT6IlEfig-k E521, DTbJvnKCrHO E509, DTBUJiDCvPQ E500, DTEEQNnCvHh E501, DThrF5Miq0- E512, DTmyro9CqUa E514, DTQRPBFiu2v E504, DTr5TQfCpG4 E516 - DS-prefix (E475–E494 era): DSLMOE6iuFH E479, DSA7b7MClVf E475, DScEatyilnk E489, DSDVSJ0itoN E476, DSfZYMUChIi E490, DShj9nlivqf E491, DSkpKC_iie8 E491, DSPfEuWCmTg E483, DSvasHCCiSX E494, DSZmIhOCrTv E488 - 4 Gemini visual analyses successful (DT0G7SyCtGg, DT6IlEfig-k, DTBUJiDCvPQ, DScEatyilnk). DSfZYMUChIi + DSZmIhOCrTv hit Gemini 429 quota exhaustion; captions on those are still detailed. Mid-period work is dominated by **Audio Particle Clones** (E483→E491) — beat-snapshot human silhouette as particle clouds layered with live depth visuals. This is the direct ancestor of the recent "Sunset Clone Plane" (E605) and "Motion Sparks 4" (E579) work. Three things are clearer here than in the recent reels: 1. **Snapshot timing is a published failure mode.** E491 (DSkpKC_iie8): "needs a response time/curve adding so that snapshot pose/shape holds for a bit longer (maybe 250ms) and then slightly eases into the gravity fall, so you have time to read the shape better." → For LUME `LumeCloneSnapshot.cs`: `holdDuration = 0.25s`, then ease-in to gravity. Don't drop straight to physics. 2. **Audio reactivity is two-stage with a feedback loop**, not a single mapping. Beat trigger → snapshot AND audio FFT → reactive logo blend-shape inflation → blend-shape adds motion vectors to fluid sim → fluid sim moves OTHER particles → speed-to-brightness lights them up. (E489 + E490). This is a self-reinforcing cascade, not parallel channels. 3. **Speed→brightness is the "twinkle" parameter.** Every audio clones reel calls it out as the secret-sauce visual flourish that makes the system feel alive. Brightness boost is a power curve with a threshold — overshoot → blow-out, undershoot → no twinkle. Tune by ear.