Audio-visual coherence requires agreement on energy, spectral balance, and section — reactive motion alone does not guarantee it

A mapping can make a visual react to audio while still reading as noise or mud if the coupling is arbitrary. Coherence — the sense that sound and image agree — requires three simultaneous alignments: (1) energy agreement, where louder/busier audio yields more visual activity; (2) spectral agreement, where bass drives large/slow elements and highs drive fine/fast detail; (3) section agreement, where the visual intensity tracks the arrangement arc. Random band-to-parameter couplings may produce motion but fail at all three axes simultaneously. Self-checking each axis before committing a patch is the recommended workflow.

Examples

Louder music making the image calmer is an inverted energy coupling — usually incoherent unless deliberately ironic. Driving five parameters from the same band is a spectral mud failure: everything pumps together.

Assessment

Given a patch where bass drives hue flicker and highs drive overall scale, identify which coherence axis is violated and explain how to fix it by reassigning the bands.