{
  "date": "2026-10-12",
  "machine": "Windows test machine",
  "method": "Synthetic source through actual FFmpeg two-branch filter graphs and signed16-bit WAV encoding. Monitor WAV is a rendered branch, not captured speaker output. No mic, ADC, browser, permission, listening, clipping or MIDI conversion tested.",
  "ffmpegVersion": "ffmpeg version N-92722-gf22fcd4483 Copyright (c) 2000-2018 the FFmpeg developers",
  "source": {
    "file": "source.wav",
    "bytes": 192044,
    "sha256": "b205f0a5e5948863c8834268373d50469da89fef2500c1d6ee44d4c8258efc90",
    "frames": 96000,
    "rate": 48000,
    "pcmSHA256": "6a9fe5b01a587fde96e237334c6b6eab3731c9498653fa0e0d877748250cdbef",
    "peakCounts": 24576,
    "peakDBFS": -2.4987747321659985,
    "rmsFS": 0.5285561435233953,
    "railSamples": 0
  },
  "results": [
    {
      "label": "baseline",
      "sharedGain": 1,
      "recordGain": 1,
      "monitorGain": 1,
      "graph": "[0:a]volume=1:precision=double,asplit=2[r][m];[r]volume=1:precision=double[record];[m]volume=1:precision=double[monitor]",
      "record": {
        "file": "baseline-record.wav",
        "bytes": 192044,
        "sha256": "b205f0a5e5948863c8834268373d50469da89fef2500c1d6ee44d4c8258efc90",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "6a9fe5b01a587fde96e237334c6b6eab3731c9498653fa0e0d877748250cdbef",
        "peakCounts": 24576,
        "peakDBFS": -2.4987747321659985,
        "rmsFS": 0.5285561435233953,
        "railSamples": 0
      },
      "monitor": {
        "file": "baseline-monitor.wav",
        "bytes": 192044,
        "sha256": "b205f0a5e5948863c8834268373d50469da89fef2500c1d6ee44d4c8258efc90",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "6a9fe5b01a587fde96e237334c6b6eab3731c9498653fa0e0d877748250cdbef",
        "peakCounts": 24576,
        "peakDBFS": -2.4987747321659985,
        "rmsFS": 0.5285561435233953,
        "railSamples": 0
      },
      "recordSameAsBaseline": true,
      "monitorSameAsBaseline": true
    },
    {
      "label": "monitor-only",
      "sharedGain": 1,
      "recordGain": 1,
      "monitorGain": 0.25,
      "graph": "[0:a]volume=1:precision=double,asplit=2[r][m];[r]volume=1:precision=double[record];[m]volume=0.25:precision=double[monitor]",
      "record": {
        "file": "monitor-only-record.wav",
        "bytes": 192044,
        "sha256": "b205f0a5e5948863c8834268373d50469da89fef2500c1d6ee44d4c8258efc90",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "6a9fe5b01a587fde96e237334c6b6eab3731c9498653fa0e0d877748250cdbef",
        "peakCounts": 24576,
        "peakDBFS": -2.4987747321659985,
        "rmsFS": 0.5285561435233953,
        "railSamples": 0
      },
      "monitor": {
        "file": "monitor-only-monitor.wav",
        "bytes": 192044,
        "sha256": "40b5599cc6306938ae4672b77b989ad3f171f202b5c8a92967f7200798e1eacf",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "e47d3d9509ea9b6d18ec0c21d470db846f17286ef563d121d9815d21a9be87c2",
        "peakCounts": 6144,
        "peakDBFS": -14.539974558725246,
        "rmsFS": 0.13213852681817861,
        "railSamples": 0
      },
      "recordSameAsBaseline": true,
      "monitorSameAsBaseline": false
    },
    {
      "label": "record-only",
      "sharedGain": 1,
      "recordGain": 0.25,
      "monitorGain": 1,
      "graph": "[0:a]volume=1:precision=double,asplit=2[r][m];[r]volume=0.25:precision=double[record];[m]volume=1:precision=double[monitor]",
      "record": {
        "file": "record-only-record.wav",
        "bytes": 192044,
        "sha256": "40b5599cc6306938ae4672b77b989ad3f171f202b5c8a92967f7200798e1eacf",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "e47d3d9509ea9b6d18ec0c21d470db846f17286ef563d121d9815d21a9be87c2",
        "peakCounts": 6144,
        "peakDBFS": -14.539974558725246,
        "rmsFS": 0.13213852681817861,
        "railSamples": 0
      },
      "monitor": {
        "file": "record-only-monitor.wav",
        "bytes": 192044,
        "sha256": "b205f0a5e5948863c8834268373d50469da89fef2500c1d6ee44d4c8258efc90",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "6a9fe5b01a587fde96e237334c6b6eab3731c9498653fa0e0d877748250cdbef",
        "peakCounts": 24576,
        "peakDBFS": -2.4987747321659985,
        "rmsFS": 0.5285561435233953,
        "railSamples": 0
      },
      "recordSameAsBaseline": false,
      "monitorSameAsBaseline": true
    },
    {
      "label": "before-split",
      "sharedGain": 0.25,
      "recordGain": 1,
      "monitorGain": 1,
      "graph": "[0:a]volume=0.25:precision=double,asplit=2[r][m];[r]volume=1:precision=double[record];[m]volume=1:precision=double[monitor]",
      "record": {
        "file": "before-split-record.wav",
        "bytes": 192044,
        "sha256": "40b5599cc6306938ae4672b77b989ad3f171f202b5c8a92967f7200798e1eacf",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "e47d3d9509ea9b6d18ec0c21d470db846f17286ef563d121d9815d21a9be87c2",
        "peakCounts": 6144,
        "peakDBFS": -14.539974558725246,
        "rmsFS": 0.13213852681817861,
        "railSamples": 0
      },
      "monitor": {
        "file": "before-split-monitor.wav",
        "bytes": 192044,
        "sha256": "40b5599cc6306938ae4672b77b989ad3f171f202b5c8a92967f7200798e1eacf",
        "frames": 96000,
        "rate": 48000,
        "pcmSHA256": "e47d3d9509ea9b6d18ec0c21d470db846f17286ef563d121d9815d21a9be87c2",
        "peakCounts": 6144,
        "peakDBFS": -14.539974558725246,
        "rmsFS": 0.13213852681817861,
        "railSamples": 0
      },
      "recordSameAsBaseline": false,
      "monitorSameAsBaseline": false
    }
  ],
  "repeat": "Same-date repeat reproduced every WAV byte and measurement."
}