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A pianist presses a key in close-up. The note begins at the precise moment the key reaches its lowest point.

C1-3-42 Steady State · sound_persistence principle: Temporal Alignment (Wave)
Seedance 2.0ByteDance · proprietary
Kling 3.0 OmniKuaishou · proprietary
Veo 3.1Google · proprietary
LTX-2.3Lightricks · open
Ovi 1.1character.ai · open
JavisDiT++JavisDiT · open
MagiHumanGAIR-NLP · open
Per-prompt rubric

Basic standards

Visual presence

  • a pianist
  • a piano key

Event: a finger presses a piano key

Audio presence

  • a piano

Sound: a piano note

Key standards

Visual physical commonsense (V-PC)

  • A pianist's finger presses a single piano key in close-up, with the key visibly depressing smoothly to its lowest point in continuous physically plausible motion.

Audio physical commonsense (A-PC)

  • The audible note has the clear tonal attack and natural sustain of a real piano.

Cross-modal physical commonsense (AV-PC)

  • The audible piano-note onset coincides in time with the visible moment the key reaches its lowest point.
  • Each audible piano-note onset corresponds in time to a visible new strike of a piano key.