You can't hear what we just changed. That's the point.
Every soundscape in Particle now carries a subtle amplitude modulation at 16 Hz — the center of the beta brainwave range associated with focused attention. The modulation is 5% deep: a gentle, imperceptible fluctuation in volume that your conscious mind never notices but your auditory cortex responds to.
This isn't binaural beats. Those require headphones, survive poorly across audio codecs, and have weak evidence behind them. Amplitude modulation is different: it works in mono, survives any speaker or codec, and is backed by peer-reviewed research. A 2024 study published in Nature found that beta-range AM embedded in ambient audio produced a 119% increase in focus-associated neural oscillations.
We didn't add a toggle. We didn't add a setting. We didn't add a marketing badge. We just made the sound better. The same way a great studio engineer adds compression you never notice — it's simply there, doing its job, invisible.
Every frequency in Particle has a reason. Now every fluctuation does too.