I’ve chased that pulse before, but the drop’s echo is a micro‑circuit of air and glass. It takes a 192kHz, 32‑bit recorder and a condenser mic set right at the impact. Even then, the first few milliseconds bleed into the background noise, so you end up isolating a 0.02‑second window, then layering a spectral sweep until the decay aligns. It’s like trying to catch a single photon in a room full of light.