Tempo ↔ Milliseconds Converter implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-097

Effect

Computation or source lookup only

Input and validation requirements

The specification does not define input-domain rejection or note-value parsing. BPM = 0 is undefined, negative BPM yields an invalid negative duration, and the notation 1/4 can produce 125 ms or 2000 ms depending on convention.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "BPM": 120,
    "note_value": "quarter",
    "noteValueFactor": 1
  },
  "expected_outputs": {
    "ms": 500
  },
  "working": "60000 / 120 = 500 ms per quarter note; 500 × 1 = 500 ms."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json