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A singer holds a long note inside a stone chapel. After each held note, a warm sustained echo lingers around the room before fading.

C1-3-28 Steady State · sound_persistence principle: Reverberation (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 singer
  • a stone chapel

Event: a singer holds a note inside a chapel

Audio presence

  • a singer

Sound: a sustained sung note

Key standards

Visual physical commonsense (V-PC)

  • A single visible singer is shown inside a stone chapel.
  • The singer holds one long sustained note rather than a melody.

Audio physical commonsense (A-PC)

  • The held note carries a warm sustained reverberation tail that lingers and then fades.
  • The reverberation is consistent with reflections in a stone chapel.

Cross-modal physical commonsense (AV-PC)

  • The held note in the audio aligns in time with the singer's visibly held mouth posture.
  • The voice in the audio originates from the singer visibly performing in the chapel.