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A pianist presses a key softly, producing a gentle quiet note. Then strikes the same key hard, producing a much louder note.

C2-2-02 Event Transition · source_excitation principle: Strike Force -> Loudness (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a piano
  • a pianist

Event: a pianist presses a piano key

Audio presence

  • a piano

Sound: a piano note

Key standards

Visual physical commonsense (V-PC)

  • The same single piano key is pressed twice, first gently and then with clearly more force.

Audio physical commonsense (A-PC)

  • The second note is noticeably louder than the first note.
  • Each note has the characteristic timbre of a struck piano key.

Cross-modal physical commonsense (AV-PC)

  • Each note onset aligns in time with a visible keypress.
  • The louder note corresponds to the forceful keystrike.
  • The quieter note corresponds to the gentle keypress.