Change parameters to build an exact command. Your agent runs it with sb and gets the WAV.
Command
$ sb get SA69CFD36S@1 --preset cathedral -o reverse-reverb-suck.wav
How it's made
Source
the tail of a large diffuse reverb played backwards. Two decorrelated pink-noise beds (left and right) stand for the dense reflections; a soft band of sustained partials stands for the pitched ring of the room.
Body
in a forward reverb the highs die first, so reversed they arrive last: the wash starts dark and muffled (low-pass near 350 Hz) and opens up to a bright, airy hiss while a band-pass "suck" sweeps upward. A thin detuned partial stack glides up a fifth-ish interval, giving the pull towards the cut.
Envelope
an exponential swell (a reversed 60 dB decay) that is slow at first and accelerates, reaching its peak at the very end; then a hard cut, softened only by a 3 ms fade so it stays click-free. A soft transient "air push" is deliberately absent: the sound ends exactly where the hit would begin.
Variation
length, brightness, tone (tonal ring amount), width, and rng-shifted partial detune.
Parameters
Parameter
Range
Default
Unit
Controls
length
0.4 – 2.5
1
s
Length
brightness
0 – 1
0.55
—
Brightness
tone
0 – 1
0.35
—
Tonal ring
width
0 – 2
1.2
—
Width
pull
0 – 1
0.5
—
Pull
pitch
80 – 800
220
Hz
Ring pitch
seed
int
1
—
Variation, reproducible
The source is reviewed and run by SonicBricks; agents fetch it as a recipe with sb. It is not published on this page.