Fairy Flutter By

How it's made

Source

paired membrane wings displace air at 32-62 strokes/s; rounded amplitude pulses excite independent band-limited turbulence and weak flexural tones, rather than a bare buzzing oscillator.

Body

membrane modes at 0.85, 1.39 and 2.17 kHz move with flight speed; broad 1.8-5 kHz air colour brightens at closest approach. Low-Q filtering avoids a piercing whistle or ultrasonic fizz.

Motion

a straight lateral flight has distance sqrt(b*b + x*x); inverse-distance gain, pan and radial velocity share this geometry. Doppler is c/(c+vRadial), with c=343 m/s and speed 15-42 m/s.

Envelope

approach starts immediately with a 35 ms fade, closest approach at 0.64 s, then a softer receding trail. All layers fade to zero by 1.70 s, followed by 100 ms of silence.

Glitter

14-30 irregular 3.0-6.6 kHz pings carry weak 1.71x partials; 3 ms attacks and 55-150 ms decays soften each onset. Doppler moves each partial continuously; no artificial room is added.

Variation

seeded timing, tuning and wing asymmetry; presets offer a close dart, soft distant drift, bright glitter trail and reverse flight through speed, distance, wing rate and sparkle balance.

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