Change parameters to build an exact command. Your agent runs it with sb and gets the WAV.
Command
$ sb get BV0TAFHCEE@1 -o reveal-chord-swell.wav
How it's made
Source
a section of ensemble strings or soft synth-brass sustaining a major chord. Every chord tone is three band-limited saws (centre and +-few cents) with slow independent pitch drift, which gives the chorused ensemble width. A quiet pink-noise breath supplies bow and air, and a bed of sines on the chord's upper octaves forms the bloom.
Body
a low-pass opens from a dark, muffled chord to a bright, open one as the swell rises (the spectrum moves, not only the level) and relaxes during the tail. The chord tones enter in a quick upward spread, root first, so the chord blooms outward; the upper-octave sines enter late and ring longest, which leaves the tail pure and open instead of cut off.
Envelope
an accelerating crescendo from near silence to the peak at `swell` seconds, then an exponential release of `tail` seconds with the highs falling away first. No transient and no abrupt stop.
Variation
root pitch, chord colour (major triad, add9, major 7th, open voicing), swell and tail times, brightness and stereo width; `rng` shifts every detune, drift phase and the noise.
Parameters
Parameter
Range
Default
Unit
Controls
root
82 – 262
130.81
Hz
Root
chord
triad · add9 · maj7 · open
triad
—
Chord
swell
0.8 – 3.5
1.5
s
Swell
tail
0.6 – 3
1.3
s
Open tail
brightness
0 – 1
0.6
—
Brightness
bloom
0 – 1
0.5
—
Bloom
width
0 – 1
0.7
—
Width
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.