Bilateral audio plays the selected sound in time with the motion. How it moves depends on what the listener is using:
- Headphones: the sound moves ear to ear with the target — only the ear on the target's side plays it.
- Speakers: the sound sweeps side to side with the target.
Browsers can't tell whether headphones are plugged in, so the listener says. Your client picks 🎧 Headphones or 🔈 Speakers when they turn on sound, and can switch any time from the button in the top corner of their screen; your Audio panel shows which they chose. For in-room sessions on your own screen, set This device in the Audio panel.
- Turn on the Audio toggle in the Control Panel, choose a preset (Theta, Alpha, Delta — plus the full sound library on the paid plan or in the 21-day trial), and set the level with the Vol slider.
- Bilateral audio and the three built-in tones are free on every plan, with no limit. The full sound library is on the paid plan and in the 21-day trial; the free plan plays 10-second previews.
One thing the client must do: browsers won't play sound until the person interacts with the page, so the client taps Headphones or Speakers once to turn on sound. This does not request microphone access — it's just the browser's rule. After that, audio plays for the rest of the session.