Section-level visual intensity must be edited to match the music arrangement because no section signal crosses the AV bridge

The 4-bin FFT bridge carries instantaneous band energy but no section marker, arrangement position, or drop/intro signal. Spectral agreement (band → element) cannot produce section-level coherence on its own: the visuals may stay equally dense during an intro and a drop. Section agreement — visual sparser in breakdown, fuller in drop — is achieved by the performer editing both the music arrangement and the visual sketch together, not by any reactive mapping. Faking a build is possible by mapping a band that the arrangement is actually ramping (e.g. highs climbing during a highpass sweep open) to a rising visual element.

Examples

During a breakdown where only hats remain, the visual should also thin out. Because no section signal exists, the performer must manually simplify the Hydra sketch at the same edit that introduces the breakdown in Strudel.

Assessment

Explain why a fully-reactive Hydra sketch can still fail section-level coherence even when energy and spectral axes are well-tuned. What is the correct fix?