audio-reactive_skill

Overview

This skill binds audio analysis data to visual parameters to drive music-reactive animations and visualizers. It provides smoothing, band extraction (bass/mid/high), beat responses, and common mappings for scale, position, color, bloom, and other visual properties. Use it to connect FFT and beat detection to DOM, WebGL, Three.js, or post-processing effects.

How this skill works

The system samples an analyser (FFT or volume) and computes normalized band values for bass, mid, and high ranges. Built-in smoothers stabilize values across frames. Beat detectors trigger flash, pop, or spawn behaviors. Those outputs are applied to visual controllers (scale, rotation, brightness, emissive intensity, chromatic offset, particle emission) via simple mapping functions or timed controllers.

When to use it

• Creating audio visualizers that pulse, glow, or animate to music.
• Driving Three.js or React Three Fiber materials, transforms, and post-processing.
• Adding beat-triggered effects like flashes, particle spawns, or timeline pops.
• Syncing UI elements (DOM) to live audio or playback files.
• Optimizing visuals for performance-sensitive environments with smoothing and throttling.

Best practices

• Normalize FFT dB values to a 0–1 range and apply per-band smoothers to avoid jitter.
• Run expensive visual updates at lower frequency (e.g., every other frame) and batch DOM changes inside requestAnimationFrame.
• Use beat cooldowns or debounce to avoid repeated triggers; combine with decay-based animations for natural results.
• Map different frequency bands to appropriate properties: bass→scale/brightness, mid→rotation/position, high→detail/shimmer/chromatic effects.
• Prefer CSS variables or shader uniforms for updating many objects efficiently instead of per-element style writes.

Example use cases

• Pulse a hero element on bass while high frequencies add micro-shakes to text for energy.
• Drive a React Three Fiber sphere: bass scales the mesh, mid increases rotation speed, high raises emissive intensity.
• Trigger particle bursts on detected beats using a BeatSpawner with cooldown to limit spawn rate.
• Make post-processing bloom react to low frequencies and chromatic aberration respond to highs for cinematic motion.
• Use an audio-driven GSAP timeline to advance visual sequences proportionally to bass energy.