键盘声画打击乐

Preload a set of short original samples into AudioBuffers and map each key to a sample plus an animation factory. Each animation creates a few vector shapes (circles, lines, polygons) in SVG or canvas, tweens their scale, rotation or stroke dash over 300–800 ms with easing, then removes them. Use a single palette object for background and shape colors and let the spacebar swap palettes and sample banks. On touch devices, divide the screen into a grid of zones that map to keys.