{
  "_comment": "Golden vectors for the PM track format. See docs/track-format.md. Each case: parse `in`, normalize, compare to `norm`. status: stable|divergence|new. expectFail lists impls (js/py) known to mismatch today; an UNlisted mismatch is a regression, and a listed PASS means the gap was fixed. NOTE: stable cases use EXPLICIT =patterns on every lane, because lanes with no =pattern currently produce DIFFERENT defaults on web vs device (see the 'default-pattern' case + docs §6).",
  "cases": [
    {
      "id": "minimal",
      "status": "stable",
      "in": "t120;kick:4=Xxxx",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "backbeat",
      "status": "stable",
      "in": "t120;kick:4=Xxxx;snare:4=.x.x;hatClosed:4/2=X.x.x.x.",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [
          { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] },
          { "sound": "snare", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [0,1,0,1] },
          { "sound": "hatClosed", "groups": [4], "sub": 2, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,1,0,1,0,1,0] }
        ] }
    },
    {
      "id": "odd-meter-2+2+3",
      "status": "stable",
      "in": "t130;kick:2+2+3=x..x..x;hatClosed:2+2+3/2=X.x.X.x.X.x.x.",
      "norm": { "bpm": 130, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [
          { "sound": "kick", "groups": [2,2,3], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [1,0,0,1,0,0,1] },
          { "sound": "hatClosed", "groups": [2,2,3], "sub": 2, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,1,0,2,0,1,0,2,0,1,0,1,0] }
        ] }
    },
    {
      "id": "swing",
      "status": "stable",
      "in": "t150;ride:4/2s=X.x.x.x.;kick:4=X..x",
      "norm": { "bpm": 150, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [
          { "sound": "ride", "groups": [4], "sub": 2, "swing": true, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,1,0,1,0,1,0] },
          { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,0,1] }
        ] }
    },
    {
      "id": "ghost-notes",
      "status": "stable",
      "in": "t92;snare:4/3=..gg.gX.gg.g",
      "norm": { "bpm": 92, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "snare", "groups": [4], "sub": 3, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [0,0,3,3,0,3,2,0,3,3,0,3] } ] }
    },
    {
      "id": "polymeter",
      "status": "stable",
      "in": "t100;kick:4=Xxxx;claves:5=Xxxxx~",
      "norm": { "bpm": 100, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [
          { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] },
          { "sound": "claves", "groups": [5], "sub": 1, "swing": false, "poly": true, "mute": false, "gainDb": 0, "levels": [2,1,1,1,1] }
        ] }
    },
    {
      "id": "disabled-lane",
      "status": "stable",
      "in": "t120;kick:4=Xxxx;hatClosed:4=Xxxx!",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [
          { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] },
          { "sound": "hatClosed", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": true, "gainDb": 0, "levels": [2,1,1,1] }
        ] }
    },
    {
      "id": "ramp",
      "status": "stable",
      "in": "t80;woodblock:4=Xxxx;rmp80/4/4",
      "norm": { "bpm": 80, "bars": 0, "volume": null, "countMs": 0, "ramp": { "start": 80, "amt": 4, "every": 4 }, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "woodblock", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "gap-trainer",
      "status": "stable",
      "in": "t100;kick:4=Xxxx;tr2/2",
      "norm": { "bpm": 100, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": { "play": 2, "mute": 2 }, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "segment-bars",
      "status": "stable",
      "in": "t88;b8;kick:4=X.x.",
      "norm": { "bpm": 88, "bars": 8, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,1,0] } ] }
    },
    {
      "id": "gm-note-number-alias",
      "status": "stable",
      "in": "t120;36:4=Xxxx",
      "note": "GM note 36 = kick. Both engines resolve the number to the voice name.",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },

    {
      "id": "default-pattern",
      "status": "stable",
      "note": "No =pattern: every subdivision sounds at normal; accent only on group starts (the grouping is the accent map). One group of 4 ⇒ accent on beat 1 only, off-8ths sound at normal.",
      "in": "t120;hatClosed:4/2",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "hatClosed", "groups": [4], "sub": 2, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1,1,1,1,1] } ] }
    },
    {
      "id": "default-pattern-odd-meter",
      "status": "stable",
      "note": "No =pattern over a 2+2+3 grouping ⇒ accents land on group starts (beats 1,3,5); all 8ths sound.",
      "in": "t130;hatClosed:2+2+3/2",
      "norm": { "bpm": 130, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "hatClosed", "groups": [2,2,3], "sub": 2, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1,2,1,1,1,2,1,1,1,1,1] } ] }
    },
    {
      "id": "euclid",
      "status": "stable",
      "note": "Euclid (k,n) shorthand: 3 hits spread over 8 steps, first accented. Parsed identically on both engines.",
      "in": "t120;kick:4(3,8)",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 2, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,0,0,1,0,0,1,0] } ] }
    },
    {
      "id": "vol-and-countin",
      "status": "divergence",
      "expectFail": ["py"],
      "note": "INTENTIONAL host difference (permanent, not a bug): vol (master volume) and cd (count-in) are web-authoring fields. The device has a hardware volume knob and no count-in, so it omits them. Kept as a vector to document the boundary.",
      "in": "t120;vol80;cd2;kick:4=Xxxx",
      "norm": { "bpm": 120, "bars": 0, "volume": 0.8, "countMs": 2000, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "unknown-sound",
      "status": "stable",
      "note": "Unknown sound name falls back to beep on both engines.",
      "in": "t120;blorp:4=Xxxx",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "beep", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "tempo-clamp-high",
      "status": "divergence",
      "expectFail": ["js"],
      "note": "Firmware clamps t to [5,300]; engine.js does not. Spec = clamp everywhere.",
      "in": "t999;kick:4=Xxxx",
      "norm": { "bpm": 300, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "empty-defaults-to-beep",
      "status": "divergence",
      "expectFail": ["js"],
      "note": "Firmware injects a default beep:4; engine.js returns no lanes (editor guards emptiness). Spec = beep:4.",
      "in": "",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": null, "end": null,
        "lanes": [ { "sound": "beep", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },

    {
      "id": "end-stop",
      "status": "new",
      "expectFail": ["js", "py"],
      "note": "Per-track playback flow — not yet implemented anywhere.",
      "in": "t120;kick:4=Xxxx;end=stop",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": 1, "end": "stop",
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "rep-then-next",
      "status": "new",
      "expectFail": ["js", "py"],
      "note": "Play 4 cycles then auto-advance. next ⇒ +1.",
      "in": "t120;kick:4=Xxxx;rep=4;end=next",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": 4, "end": 1,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    },
    {
      "id": "relative-goto-back-two",
      "status": "new",
      "expectFail": ["js", "py"],
      "note": "Relative goto (D.S.): after 1 cycle, jump back two tracks.",
      "in": "t120;kick:4=Xxxx;end=-2",
      "norm": { "bpm": 120, "bars": 0, "volume": null, "countMs": 0, "ramp": null, "trainer": null, "rep": 1, "end": -2,
        "lanes": [ { "sound": "kick", "groups": [4], "sub": 1, "swing": false, "poly": false, "mute": false, "gainDb": 0, "levels": [2,1,1,1] } ] }
    }
  ]
}