SFX-ENV-20261005-01

# SFX-ENV-20261005-01 — evidence

Task: classic music for towns and the GM room, area-specific environment beds and landmark emitters outside towns (ADR-026).

| File | What it is |
|---|---|
| `audio-check.json` | Objective checks on the 24 delivered environment loops: duration, peak, integrated loudness, loop-seam jump, edge dip, level swing, spectral centroid and flatness. Machine measurements only; they cannot say whether a take sounds good. |
| `silent-tail-measurement.json` | The loop defect found on the way: the model ends every clip with 0–1.35 s of digital silence, which the old loop builder looped. Before/after envelope at the seam of `amb-amber-gate`. |
| `music-audio-check.json`, `music-structure-check.json`, `music-seam.json` | The same checks on the six delivered music takes (made with the Small Music model): loudness, seam, key match, pulse; plus how softly each take opens and closes. Every take hits its requested tempo (comb fit: 92.0 BPM for Amber Gate, 100.0 for the GM room), so a 60 s loop is a whole number of beats. |
| `sfx-model-music-test.json` | Harmonic and rhythmic structure measured on the two music prompts run through the **installed SFX model** (not the music model), next to a white-noise control and a synthetic 92 BPM chord loop. |
| `sfx-model-town-theme-test.mp3`, `sfx-model-gm-theme-test.mp3` | The two 30 s clips behind that measurement, so the owner can listen and judge whether the SFX model is good enough for music. Not part of the game audio (`audio/source/`). |

Reading `sfx-model-music-test.json`: `keyR` is the best key-profile correlation (noise 0.37, a tonal piece 0.9), `diatonic` the share of
pitched energy inside one 7-note scale (noise 0.61), `pulse` the strongest 50–200 BPM regularity of the onset envelope (noise 0.05,
the 92 BPM reference 0.78 at 92.3 BPM).

[
 {
  "file": "audio/source/ambience/amb-amber-gate.mp3",
  "seconds": 20.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -3.17,
  "rmsDbfs": -29.65,
  "lufsIntegrated": -23.3,
  "loudnessRangeLu": 4.4,
  "seamJump": 0.01327,
  "seamLevelStepDb": 0.78,
  "edgeDipDb": 0.23,
  "levelSwingDb": 3.23,
  "spectralCentroidHz": 2970,
  "spectralFlatness": 0.071
 },
 {
  "file": "audio/source/ambience/amb-dewgrass-meadow.mp3",
  "seconds": 20.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -15.07,
  "rmsDbfs": -38.62,
  "lufsIntegrated": -30.1,
  "loudnessRangeLu": 7.8,
  "seamJump": 0.0008,
  "seamLevelStepDb": -2.09,
  "edgeDipDb": -0.58,
  "levelSwingDb": 2.99,
  "spectralCentroidHz": 5321,
  "spectralFlatness": 0.1022
 },
 {
  "file": "audio/source/ambience/amb-old-orchard.mp3",
  "seconds": 20.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -3.03,
  "rmsDbfs": -28.74,
…

[
 {
  "file": "audio/source/music/mus-amber-gate.mp3",
  "seconds": 60.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -3.22,
  "rmsDbfs": -19.24,
  "lufsIntegrated": -16.7,
  "loudnessRangeLu": 3.5,
  "seamJump": 0.017,
  "seamLevelStepDb": -1.76,
  "edgeDipDb": -0.98,
  "levelSwingDb": 3.37,
  "spectralCentroidHz": 1850,
  "spectralFlatness": 0.0275
 },
 {
  "file": "audio/source/music/mus-amber-gate_2.mp3",
  "seconds": 60.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -3.11,
  "rmsDbfs": -18.13,
  "lufsIntegrated": -15.5,
  "loudnessRangeLu": 2.4,
  "seamJump": 0.06911,
  "seamLevelStepDb": 8.36,
  "edgeDipDb": 5.94,
  "levelSwingDb": 2.72,
  "spectralCentroidHz": 1746,
  "spectralFlatness": 0.0263
 },
 {
  "file": "audio/source/music/mus-amber-gate_3.mp3",
  "seconds": 60.0,
  "sampleRate": 44100,
  "channels": 2,
  "peakDbfs": -3.13,
  "rmsDbfs": -18.95,
…

{
 "note": "mean 100 ms RMS over the first and last 3 s versus the median 100 ms level; a large value means the loop 'breathes' (softer passage) at its loop point",
 "takes": [
  {
   "take": "mus-amber-gate",
   "medianDbfs": -20.3,
   "first3sDbfs": -21.9,
   "last3sDbfs": -19.1,
   "seamRegionBelowMedianDb": 1.6
  },
  {
   "take": "mus-amber-gate_2",
   "medianDbfs": -18.8,
   "first3sDbfs": -20.8,
   "last3sDbfs": -18.2,
   "seamRegionBelowMedianDb": 2.0
  },
  {
   "take": "mus-amber-gate_3",
   "medianDbfs": -19.9,
   "first3sDbfs": -21.9,
   "last3sDbfs": -20.0,
   "seamRegionBelowMedianDb": 2.0
  },
  {
   "take": "mus-gm-proving-ground",
   "medianDbfs": -22.0,
   "first3sDbfs": -29.7,
   "last3sDbfs": -26.6,
   "seamRegionBelowMedianDb": 7.6
  },
  {
   "take": "mus-gm-proving-ground_2",
   "medianDbfs": -22.5,
   "first3sDbfs": -25.2,
   "last3sDbfs": -24.0,
   "seamRegionBelowMedianDb": 2.8
  },
  {
   "take": "mus-gm-proving-ground_3",
…

[
 {
  "name": "control: white noise",
  "keyR": 0.372,
  "diatonic": 0.611,
  "pulse": 0.054,
  "pulseBpm": 95.7
 },
 {
  "name": "control: synthetic C-major pluck loop at 92 BPM",
  "keyR": 0.931,
  "diatonic": 0.906,
  "pulse": 0.784,
  "pulseBpm": 92.3
 },
 {
  "name": "mus-amber-gate.mp3",
  "keyR": 0.841,
  "diatonic": 0.866,
  "pulse": 0.729,
  "pulseBpm": 61.5
 },
 {
  "name": "mus-amber-gate_2.mp3",
  "keyR": 0.936,
  "diatonic": 0.918,
  "pulse": 0.598,
  "pulseBpm": 61.5
 },
 {
  "name": "mus-amber-gate_3.mp3",
  "keyR": 0.713,
  "diatonic": 0.792,
  "pulse": 0.6,
  "pulseBpm": 184.6
 },
 {
  "name": "mus-gm-proving-ground.mp3",
  "keyR": 0.664,
  "diatonic": 0.934,
…

[
 {
  "name": "control: white noise",
  "keyR": 0.372,
  "diatonic": 0.611,
  "pulse": 0.054,
  "pulseBpm": 95.7
 },
 {
  "name": "control: synthetic C-major pluck loop at 92 BPM",
  "keyR": 0.931,
  "diatonic": 0.906,
  "pulse": 0.784,
  "pulseBpm": 92.3
 },
 {
  "name": "sfx-model-mus-amber-gate.mp3",
  "keyR": 0.814,
  "diatonic": 0.911,
  "pulse": 0.104,
  "pulseBpm": 136.0
 },
 {
  "name": "sfx-model-mus-gm-proving-ground.mp3",
  "keyR": 0.812,
  "diatonic": 0.735,
  "pulse": 0.275,
  "pulseBpm": 198.8
 },
 {
  "name": "amb-cinder-kilns.mp3",
  "keyR": 0.492,
  "diatonic": 0.706,
  "pulse": 0.204,
  "pulseBpm": 101.3
 },
 {
  "name": "amb-jade-seal-ruins.mp3",
  "keyR": 0.676,
  "diatonic": 0.98,
…

{
  "note": "Raw sm-sfx output (cfg 3, negative prompt on) measured in 10 ms blocks; 'content ends' = last block above -70 dBFS. The model ends every clip with digital silence (about -95 dBFS) whose length changes with the requested duration, so the old loop builder (which used the last 0.25 s as its overlap) looped a hole. 2026-10-05.",
  "requestedSeconds_contentEnds_silentTailSeconds": [
    [6.25, 6.25, 0.0],
    [10.25, 10.03, 0.22],
    [15.25, 13.9, 1.35],
    [20.25, 19.5, 0.75],
    [21.25, 20.08, 1.17],
    [22.25, 21.36, 0.89],
    [30.0, 29.9, 0.1],
    [45.25, 44.87, 0.38],
    [63.0, 62.54, 0.46]
  ],
  "amberGateBedSeam": {
    "note": "100 ms RMS in dBFS around the loop point, amb-amber-gate.mp3",
    "before": {
      "first1s": [-43.0, -34.0, -29.4, -31.3, -29.4, -28.6, -27.5, -27.9, -29.3, -27.6],
      "last1s": [-29.3, -30.9, -30.0, -29.8, -32.3, -77.8, -77.1, -77.3, -77.3, -77.3]
    },
    "after": {
      "first1s": [-32.7, -36.2, -33.6, -33.9, -32.5, -35.0, -37.1, -37.1, -28.5, -30.5],
      "last1s": [-31.2, -30.6, -30.0, -30.4, -30.4, -27.2, -27.7, -27.8, -28.8, -32.5]
    }
  },
  "fix": "tools/audio: trim the silent tail before building a loop, request +3 s, refuse a source that is still too short, and reject any finished loop whose first or last 100 ms sits more than 30 dB below the median 100 ms level (edge_dip_db)."
}