Package Delivered

How it's made

Source

two knuckle knocks on a cardboard or wooden box, then a small struck bell tine. Each knock is a 1–6 ms low-passed noise burst; the chime strike is a 2 ms click on a metal tine.

Body

the knock excites a few damped wood modes (30–120 ms) plus a hollow air cavity at 110–260 Hz that gives the "boom"; the chime is a fundamental with stretched partials (2.01x, 3.02x, 4.2x) whose upper partials die first, so the attack is bright and the tail is pure.

Envelope

knocks are 0.13–0.28 s apart and the second is slightly softer; after a short pause the two chime notes rise by an interval and ring 0.25–0.9 s. A final fade guarantees a clean tail near 1 s.

Variation

`rng` jitters knock timing, strength and mode tuning (about 3 %) and detunes each chime partial by 0.2 %. Hollowness sets the cavity level, box size the cavity pitch, brightness the chime partials.

The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.