A dull, deflated thump for a missed shot or a failed action: a low triangle falling a fifth, a short burst of soft noise on top, and a thin harmonic that survives on small speakers. Use it for a miss, a dud, a rejected input, or a jump that did not clear the gap. No buzzer, no shame, just weight.
body: triangle falling 196 Hz -> 118 Hz over 180 ms (a fifth down), 6 ms attack, held flat to 110 ms, then a 70 ms linear release (so the bottom of the drop is heard) puff: white noise 40 ms, low-pass 900 Hz (Q 0.7), at 22% level, right at the onset fluff: a second triangle at 88 Hz, 180 ms, 30% level, 8 ms attack, held to 120 ms, then a 60 ms linear release body upper: a triangle an octave and a fifth above the falling body (294 Hz -> 177 Hz over 180 ms) at 22% level, same hold-then-release shape — this is the part a phone speaker can actually reproduce no low-pass on the mix; the noise is already dark