Your studio
Pick one and listen. They differ in how much the sound moves, and in what sits behind it.
Acoustic Shield — a steady, soft hiss that sits over the noise around you and makes it easier to ignore. It runs alongside whatever else is playing.
Breath Pacer — a ten-second breathing cycle to follow, in and out. Works with Custom Focus.
The Lab
Shape the sound while it plays. Everything here stays inside the app’s own limits, and the preset is one tap away.
Tune it yourself
Set a frequency for each ear, any tone from 80 to 1000. Keep the two within 20 Hz of each other; the same number in both ears gives one plain tone. Two different tones need headphones: they have to reach separate ears.
A small difference (2 to 4) feels slow and deep; a larger one (10 to 20) feels quicker. Keep the volume low, and stop if it feels uncomfortable.