The app owns its audio session, so it speaks and chirps when it is asked to, keeps the screen awake, and does not need the phone woken between passes. The browser can do this too, and is here if you would rather.
Privacy
The app is ready and waiting for you.
Listening to its own speaker, to measure the delay it adds.
Measured offset
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The desk corrects this automatically — nothing to do here.
Ask the operator to measure again.
