unison
Turn a pile of phones into one speaker system. Everyone opens the same room, and the track plays on every phone at the same moment. The phones listen to each other through the microphone and line themselves up.
Reconnecting…
🎤 Listening… keep quiet for a few seconds
Volume all the way up. The phone will ask for the microphone: allow it, that is how the phones line up.
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Calibration
Phones
Details
Keep the screen on and the browser in front. Lags show how early each phone plays to make up for its own delay; only the differences matter.