crackle

The network's own sound: 72 short decaying clicks scattered over two seconds of mono 24 kHz, synthesised with audio.encodePcm and stored as pcm so the loop joins without a click (loopSeam().ratio reads 0.0). Every click lands whole inside the buffer, so the first and last samples are silence.

FruitFlyBrain plays it from the Brain entity on a looping spatial Audio component and sets its volume from the whole-network firing rate: silent below 0.05 Hz, rising to a ceiling of 0.35 by 5 Hz. A reset is silence, the taste experiment's 1.3 Hz is a crackle, the auditory control's 4.6 Hz is a hiss.