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  "status": "Unapproved standalone instrument prototype; no listening or realism claim",
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      "modelSampleRate": 88200,
      "registerVentRadiusMm": 0.65,
      "keyTimeConstantMs": 6.0,
      "keyStateResets": 0,
      "tongueModel": "Compliant force and contact damping on the reed; no tongue-driven mouthpiece-gap changes.",
      "radiationModel": "Actual outlet flow after the key aperture; no crossfaded flow-summing masks.",
      "limits": "Generic geometry; mixed trapezoidal/backward-Euler lumped acoustics; prescribed key motion does mechanical work not included in the energy trace."
    }
  },
  "limits": [
    "Designed generic geometry and provisional physical coefficients, not a measured alto saxophone",
    "Key aperture motion preserves states but prescribed key-muscle work is not included in the energy trace",
    "Tongue is one compliant closing-contact approximation, not a complete measured human articulation model",
    "Register changes also use prescribed breath and slow embouchure adjustment",
    "Mixed trapezoidal and backward-Euler lumped acoustics, reference-frequency wall loss, first-order radiation",
    "No upstream vocal tract, detailed bell directivity, or external tonehole interaction",
    "Pitch checks cover only these probes, not the full instrument range or fast music",
    "Earlier-merge diagnostics identify correlated spikes, not measured attribution to a single cause",
    "Numerical checks do not establish that this sounds better or realistic"
  ]
}