Boombox

Gizmo pack gadget: a boombox with two pumping woofers, a cassette window with turning reels, a level meter, piano keys on top, dials, a carry handle and a telescopic antenna. On the beat the cones pump, the meter dances and the keys press along. A tap drops the bass: the woofers punch out and the whole box hops. Raymarched in WebGL, six palettes.